mirror of
https://github.com/alliedmodders/metamod-source.git
synced 2025-12-06 18:08:31 +00:00
Introduce varardic hook macros
This is a large refactor that splits our mega-template into a few smaller ones. First off, the PLUGIN_GLOBALVARS() helpers were put in the SourceHook namespace. - HookHandlerImpl: Responsible for the lowered delegates (post-vafmt), can be used independently of other templates added here. Relies on parent HookManager class to handle the unlowered original invocation logic. (As a template parameter) - HookCoreImpl: Adds a public interface & glue layer beterrn managers and HookHandlerImpl - HookImpl: non-varardic hook manager - FmtHookImpl: format-string hook manager FmtHookImpl was tested by hooking IVEngineServer::ClientCommand.
This commit is contained in:
Mooshua
parent
d96b3adb0a
commit
50772ffc46
@ -475,14 +475,24 @@ using namespace SourceMM;
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/**
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* @brief This should be in one of your header files, if you wish
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* to use values like g_SHPtr in other files.
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* This also creates helpers for accessing the SourceHook templates.
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*/
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#define PLUGIN_GLOBALVARS() \
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extern SourceHook::ISourceHook *g_SHPtr; \
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extern ISmmAPI *g_SMAPI; \
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extern ISmmPlugin *g_PLAPI; \
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extern PluginId g_PLID; \
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template<typename Interface, auto Method, typename Result, typename... Args> \
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struct Hook : public ::SourceHook::HookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...> {};
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#define PLUGIN_GLOBALVARS() \
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extern SourceHook::ISourceHook *g_SHPtr; \
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extern ISmmAPI *g_SMAPI; \
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extern ISmmPlugin *g_PLAPI; \
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extern PluginId g_PLID; \
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namespace SourceHook \
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{ \
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template <typename Interface, auto Method, typename Result, typename... Args> \
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struct Hook : public ::SourceHook::HookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...> \
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{ \
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}; \
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template <typename Interface, auto Method, typename Result, typename... Args> \
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struct FmtHook : public ::SourceHook::FmtHookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...> \
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{ \
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}; \
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}
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/**
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* @brief This should be the first line in your Load callback.
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@ -328,8 +328,17 @@ extern PluginId g_PLID;
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extern SourceHook::ISourceHook *g_SHPtr;
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extern SourceMM::IMetamodSourceProvider *provider;
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extern SourceMM::ISmmAPI *g_pMetamod;
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template<typename Interface, auto Method, typename Result, typename... Args> \
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struct Hook : public ::SourceHook::HookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...> {};
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namespace SourceHook
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{
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template <typename Interface, auto Method, typename Result, typename... Args>
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struct Hook : public ::SourceHook::HookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...>
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{
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};
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template <typename Interface, auto Method, typename Result, typename... Args>
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struct FmtHook : public ::SourceHook::FmtHookImpl<&g_SHPtr, &g_PLID, Interface, Method, Result, Args...>
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{
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};
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}
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#endif //_INCLUDE_METAMOD_SOURCE_SUPPORT_H_
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@ -44,14 +44,14 @@ static SourceProvider g_SourceProvider;
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IMetamodSourceProvider* provider = &g_SourceProvider;
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auto OnGameInit = Hook<IServerGameDLL, &IServerGameDLL::GameInit, bool>::Make();
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auto OnLevelInit = Hook<IServerGameDLL, &IServerGameDLL::LevelInit, bool, const char*, const char*, const char*, const char*, bool, bool>::Make();
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auto OnLevelShutdown = Hook<IServerGameDLL, &IServerGameDLL::LevelShutdown, void>::Make();
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auto OnGameInit = SourceHook::Hook<IServerGameDLL, &IServerGameDLL::GameInit, bool>::Make();
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auto OnLevelInit = SourceHook::Hook<IServerGameDLL, &IServerGameDLL::LevelInit, bool, const char*, const char*, const char*, const char*, bool, bool>::Make();
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auto OnLevelShutdown = SourceHook::Hook<IServerGameDLL, &IServerGameDLL::LevelShutdown, void>::Make();
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#if SOURCE_ENGINE >= SE_ORANGEBOX
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auto OnClientCommand = Hook<IServerGameClients, &IServerGameClients::ClientCommand, void, edict_t*, const CCommand&>::Make();
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auto OnClientCommand = SourceHook::Hook<IServerGameClients, &IServerGameClients::ClientCommand, void, edict_t*, const CCommand&>::Make();
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#else
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auto OnClientCommand = Hook<IServerGameClients, &IServerGameClients::ClientCommand, void, edict_t*>::Make();
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auto OnClientCommand = SourceHook::Hook<IServerGameClients, &IServerGameClients::ClientCommand, void, edict_t*>::Make();
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#endif
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void SourceProvider::Notify_DLLInit_Pre(CreateInterfaceFn engineFactory,
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@ -116,6 +116,7 @@
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#define SH_PTRSIZE sizeof(void*)
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#include <cstdarg>
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#include <type_traits>
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#include "sh_memfuncinfo.h"
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#include "FastDelegate.h"
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@ -665,6 +666,10 @@ namespace SourceHook
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* Original - call the original method and safely handle the return type
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* Dereference - dereference the return type pointer for hook return semantics
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*
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* OriginalRaised - a little special, we call a static func from the parent hook
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* manager class to raise lowered arguments passed to the core delegates. This is
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* used when the core delegates receive different args than the root proto (eg, varargs!)
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*
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*/
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template<ISourceHook** SourceHook, typename Result, typename... Args>
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struct BaseMethodInvoker
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@ -692,6 +697,13 @@ namespace SourceHook
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(self->*mfp)(args...);
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}
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template<typename Self, typename Mfp>
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static void OriginalRaised( void (*Invoker)(Self, Mfp, Args...), Self self, Mfp mfp, void* result, Args... args )
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{
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// Do not touch return type: It's void!
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Invoker(self, mfp, args...);
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}
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static void Dereference(const void* arg)
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{
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return;
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@ -716,11 +728,206 @@ namespace SourceHook
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*result = (self->*mfp)(args...);
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}
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template<typename Self, typename Mfp>
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static void OriginalRaised( Result (*Invoker)(Self, Mfp, Args...), Self self, Mfp mfp, Result* result, Args... args )
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{
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*result = Invoker(self, mfp, args...);
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}
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static Result Dereference(const Result* arg)
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{
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return *arg;
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}
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};
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/**
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* @brief defines the interface from the hook manager -> user code
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*
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* This is invoked from the hook manager to call SourceHook delegates once
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* the hook manager has lowered arguments/etc into the receiving delegate types.
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*/
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template<ProtoInfo::CallConvention Convention, typename Result, typename... Args>
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struct HookHandlerImpl
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{
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public:
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/**
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* @brief The delegate type that SourceHook will invoke (user code)
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*/
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typedef typename fastdelegate::FastDelegate<Result, Args...> Delegate;
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struct IMyDelegate : ::SourceHook::ISHDelegate
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{
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public:
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virtual Result Call(Args... args) = 0;
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};
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struct CMyDelegateImpl : IMyDelegate
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{
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public:
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Delegate _delegate;
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CMyDelegateImpl(Delegate deleg) : _delegate(deleg)
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{}
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virtual~CMyDelegateImpl() {}
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Result Call(Args... args) { return _delegate(args...); }
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void DeleteThis() { delete this; }
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bool IsEqual(ISHDelegate *pOtherDeleg) { return _delegate == static_cast<CMyDelegateImpl *>(pOtherDeleg)->_delegate; }
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};
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/**
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* @brief An object containing a safely-allocatable return type
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*
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* Used when stack-allocating the return type;
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* void returns are never written to so using void* is safe.
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* when the return is not zero-sized, use the return itself.
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*/
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typedef typename metaprogramming::if_else<
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std::is_void<Result>::value,
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void*,
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Result
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>::type VoidSafeResult;
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/**
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* @brief A return type that is C++-reference-safe.
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*
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* Prevents us from doing silly things with byref-passed values.
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*/
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typedef typename ReferenceCarrier<VoidSafeResult>::type ResultType;
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::SourceHook::ProtoInfo Proto;
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/**
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* @brief Build the ProtoInfo for this hook
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*/
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constexpr HookHandlerImpl()
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{
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// build protoinfo
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Proto.numOfParams = sizeof...(Args);
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Proto.convention = Convention;
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if constexpr (std::is_void_v<Result>) {
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Proto.retPassInfo = {0, 0, 0};
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} else {
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Proto.retPassInfo = { sizeof(Result), ::SourceHook::GetPassInfo< Result >::type, ::SourceHook::GetPassInfo< Result >::flags };
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}
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// Iterate over the args... type pack
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auto paramsPassInfo = new PassInfo[sizeof...(Args) + 1];
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paramsPassInfo[0] = { 1, 0, 0 };
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Proto.paramsPassInfo = paramsPassInfo;
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detail::PrototypeBuilderFunctor argsBuilder(paramsPassInfo);
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metaprogramming::for_each_template_nullable<detail::PrototypeBuilderFunctor, Args...>(&argsBuilder);
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// Build the backwards compatible paramsPassInfoV2 field
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Proto.retPassInfo2 = {0, 0, 0, 0};
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auto paramsPassInfo2 = new PassInfo::V2Info[sizeof...(Args) + 1];
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Proto.paramsPassInfo2 = paramsPassInfo2;
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for (int i = 0; i /* lte to include thisptr! */ <= sizeof...(Args); ++i) {
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paramsPassInfo2[i] = { 0, 0, 0, 0 };
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}
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}
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template<ISourceHook** SH, typename Invoker, typename InstType>
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static Result HookImplCore(InstType* Instance, void* self, Args... args)
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{
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// Note to all ye who enter here:
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// Do not, do NOT--DO NOT: touch "this" or any of our member variables.
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// Hands off bucko. USE THE STATIC INSTANCE! (thisptr is undefined!!)
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using namespace ::SourceHook;
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void *ourvfnptr = reinterpret_cast<void *>(
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*reinterpret_cast<void ***>(reinterpret_cast<char *>(self) + Instance->MFI.vtbloffs) + Instance->MFI.vtblindex);
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void *vfnptr_origentry;
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META_RES status = MRES_IGNORED;
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META_RES prev_res;
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META_RES cur_res;
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ResultType original_ret;
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ResultType override_ret;
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ResultType current_ret;
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IMyDelegate *iter;
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IHookContext *context = (*SH)->SetupHookLoop(
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Instance->HI,
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ourvfnptr,
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reinterpret_cast<void *>(self),
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&vfnptr_origentry,
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&status,
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&prev_res,
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&cur_res,
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&original_ret,
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&override_ret);
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// Call all pre-hooks
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prev_res = MRES_IGNORED;
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while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
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cur_res = MRES_IGNORED;
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Invoker::Invoke(iter, ¤t_ret, args...);
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prev_res = cur_res;
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if (cur_res > status)
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status = cur_res;
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if (cur_res >= MRES_OVERRIDE)
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*reinterpret_cast<ResultType *>(context->GetOverrideRetPtr()) = current_ret;
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}
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// Call original method
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if (status != MRES_SUPERCEDE && context->ShouldCallOrig()) {
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typename Invoker::base::EmptyDelegate original;
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reinterpret_cast<void **>(&original)[0] = vfnptr_origentry;
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// A little hacky, but I think this is probably the best way to go about this.
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// the parent ("InstType") is capable of lowering arguments for us; in other words,
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// they'll take tough ABI semantics like varargs and crunch them into an object we can
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// actually pass around. Unfortunately, that means we can't call the original delegate,
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// as then we'd be trying to give it the "lowered" argument that we gave it.
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//
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// To work around this, we've exposed the unlowered types to the implementation core here,
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// and we're going to give control of actually invoking the original to the hook manager
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// that actually lowered the args for us.
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//
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// These semantics are a little rough but it makes more sense from the parent-class side of things.
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typename InstType::UnloweredSelf* known_self = reinterpret_cast<InstType::UnloweredSelf*>(self);
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typename InstType::UnloweredDelegate known_mfp = reinterpret_cast<InstType::UnloweredDelegate>(original);
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Invoker::OriginalRaised( &InstType::InvokeUnlowered, known_self, known_mfp, &original_ret, args... );
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} else {
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// TODO: Do we use context->GetOriginalRetPtr() here?
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// this is inherited from the macro versions to prevent semantic differences.
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original_ret = override_ret;
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}
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// Call all post-hooks
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prev_res = MRES_IGNORED;
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while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
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cur_res = MRES_IGNORED;
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Invoker::Invoke(iter, ¤t_ret, args...);
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prev_res = cur_res;
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if (cur_res > status)
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status = cur_res;
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if (cur_res >= MRES_OVERRIDE)
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*reinterpret_cast<VoidSafeResult *>(context->GetOverrideRetPtr()) = current_ret;
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}
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const ResultType* result_ptr = reinterpret_cast<const ResultType *>((status >= MRES_OVERRIDE)
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? context->GetOverrideRetPtr()
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: context->GetOrigRetPtr());
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(*SH)->EndContext(context);
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return Invoker::Dereference(result_ptr);
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}
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};
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}
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/**
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@ -730,8 +937,8 @@ namespace SourceHook
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{
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public:
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HookInstance(ISourceHook** sh, int hookid)
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: SH(sh)
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, _hookid(hookid)
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: SH(sh)
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, _hookid(hookid)
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{}
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protected:
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// The global pointer to the SourceHook API
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@ -746,37 +953,25 @@ namespace SourceHook
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* @brief Returns true if the hook was successfully placed.
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* @return
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*/
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bool Ok()
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{
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return _hookid != 0;
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}
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bool Ok() { return _hookid != 0; }
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/**
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* @brief Pause the hook, preventing it from being called until unpaused.
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* @return
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*/
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bool Pause()
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{
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return (*SH)->PauseHookByID(_hookid);
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}
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bool Pause() { return (*SH)->PauseHookByID(_hookid); }
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/**
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* @brief Unpause the hook if it is currently paused
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* @return
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*/
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bool Unpause()
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{
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return (*SH)->UnpauseHookByID(_hookid);
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}
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bool Unpause() { return (*SH)->UnpauseHookByID(_hookid); }
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/**
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* @brief Remove the hook, permanently preventing it from being invoked.
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* @return
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*/
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bool Remove()
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{
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return (*SH)->RemoveHookByID(_hookid);
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}
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bool Remove() { return (*SH)->RemoveHookByID(_hookid); }
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};
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/**
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@ -786,79 +981,80 @@ namespace SourceHook
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* and prototype in the template arguments. Any derived class of the interface
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* can be hooked using this manager.
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*/
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template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
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struct HookImpl
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template<
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// SourceHook core
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ISourceHook** SH, Plugin* PL,
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// Hooked object
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typename Interface, auto Method,
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// Hooked object type
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typename MemberMethod, ProtoInfo::CallConvention Convention,
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// Parent where lowering will occur
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typename Parent,
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// Delegate type
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typename Result, typename... Args>
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struct HookCoreImpl
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{
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protected:
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typedef typename ::SourceHook::detail::HookHandlerImpl<Convention, Result, Args...> HookHandlerImpl;
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typedef typename HookHandlerImpl::Delegate Delegate;
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typedef typename HookHandlerImpl::IMyDelegate IMyDelegate;
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typedef typename HookHandlerImpl::CMyDelegateImpl CMyDelegateImpl;
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friend HookHandlerImpl;
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/**
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* @brief An object containing methods to safely handle the return type
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*
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* This allows us to safely handle zero-sized types as return values.
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*/
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typedef typename metaprogramming::if_else<
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std::is_void<Result>::value,
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detail::VoidMethodInvoker<SH, IMyDelegate, Args...>,
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detail::ReturningMethodInvoker<SH, IMyDelegate, Result, Args...>
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>::type Invoker;
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/**
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* @brief The type we expect the template arg "Method" to be.
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* Method is the MFP we will be hooking, so they need to be exact!
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*/
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typedef Result (Interface::*MemberMethod)(Args...);
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typedef fastdelegate::FastDelegate<Result, Args...> Delegate;
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// typedef Result (Interface::*MemberMethod)(Args...);
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typedef decltype(Method) MethodType;
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static_assert( std::is_same<MethodType, MemberMethod>::type::value, "Mismatched template parameters!" );
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// uh oh, Parent is technically uninitialized here.
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// should find a workaround, this would be nice to have.
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//static_assert( std::is_base_of<HookCoreImpl, Parent>::type::value, "Mismatched hookman parent type! (INTERNAL ERROR - REPORT THIS AS A BUG)");
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// Members
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::SourceHook::MemFuncInfo MFI;
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::SourceHook::IHookManagerInfo *HI;
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::SourceHook::ProtoInfo Proto;
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HookHandlerImpl HookHandler;
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// Singleton instance
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// Initialized below!
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static HookImpl Instance;
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static Parent Instance;
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private:
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HookImpl(HookImpl& other) = delete;
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protected:
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HookCoreImpl(HookCoreImpl& other) = delete;
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/**
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* @brief Build the ProtoInfo for this hook
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*/
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constexpr HookImpl()
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constexpr HookCoreImpl()
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// Build the ProtoInfo object
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: HookHandler(HookHandlerImpl())
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{
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// build protoinfo
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Proto.numOfParams = sizeof...(Args);
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Proto.convention = ProtoInfo::CallConv_Unknown;
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if constexpr (std::is_void_v<Result>) {
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Proto.retPassInfo = {0, 0, 0};
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} else {
|
||||
Proto.retPassInfo = { sizeof(Result), ::SourceHook::GetPassInfo< Result >::type, ::SourceHook::GetPassInfo< Result >::flags };
|
||||
}
|
||||
|
||||
// Iterate over the args... type pack
|
||||
auto paramsPassInfo = new PassInfo[sizeof...(Args) + 1];
|
||||
paramsPassInfo[0] = { 1, 0, 0 };
|
||||
Proto.paramsPassInfo = paramsPassInfo;
|
||||
|
||||
detail::PrototypeBuilderFunctor argsBuilder(paramsPassInfo);
|
||||
metaprogramming::for_each_template_nullable<detail::PrototypeBuilderFunctor, Args...>(&argsBuilder);
|
||||
|
||||
|
||||
// Build the backwards compatible paramsPassInfoV2 field
|
||||
Proto.retPassInfo2 = {0, 0, 0, 0};
|
||||
auto paramsPassInfo2 = new PassInfo::V2Info[sizeof...(Args) + 1];
|
||||
Proto.paramsPassInfo2 = paramsPassInfo2;
|
||||
|
||||
for (int i = 0; i /* lte to include thisptr! */ <= sizeof...(Args); ++i) {
|
||||
paramsPassInfo2[i] = { 0, 0, 0, 0 };
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
public:
|
||||
static constexpr HookImpl* Make()
|
||||
{
|
||||
HookImpl::Instance = HookImpl();
|
||||
|
||||
return &HookImpl::Instance;
|
||||
}
|
||||
|
||||
public: // Public Interface
|
||||
|
||||
/**
|
||||
* @brief Add an instance of this hook to the specified interface
|
||||
*
|
||||
* @param id the g_PLID value for the plugin creating the hook
|
||||
* @param iface the interface pointer to hook
|
||||
* @param post true when post-hooking, false when pre-hooking.
|
||||
* @param handler the handler that will be called in place of the original method
|
||||
@ -869,19 +1065,19 @@ namespace SourceHook
|
||||
using namespace ::SourceHook;
|
||||
MemFuncInfo mfi = {true, -1, 0, 0};
|
||||
GetFuncInfo(Method, mfi);
|
||||
|
||||
if (mfi.thisptroffs < 0 || !mfi.isVirtual)
|
||||
return HookInstance(SH, 0);
|
||||
return {SH, false};
|
||||
|
||||
CMyDelegateImpl* delegate = new CMyDelegateImpl(handler);
|
||||
int id = (*SH)->AddHook(*PL, mode, iface, mfi.thisptroffs, HookImpl::HookManPubFunc, delegate, post);
|
||||
int id = (*SH)->AddHook(*PL, mode, iface, mfi.thisptroffs, HookCoreImpl::HookManPubFunc, delegate, post);
|
||||
|
||||
return HookInstance(SH, id);
|
||||
return {SH, id};
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Remove an existing hook handler from this interface
|
||||
*
|
||||
* @param id the g_PLID value for the plugin the hook was created under
|
||||
* @param iface the interface to be unhooked
|
||||
* @param post true if this was a post hook, false otherwise (pre-hook)
|
||||
* @param handler the handler that will be removed from this hook.
|
||||
@ -894,10 +1090,17 @@ namespace SourceHook
|
||||
|
||||
// Temporary delegate for .IsEqual() comparison.
|
||||
CMyDelegateImpl temp(handler);
|
||||
return (*SH)->RemoveHook(*PL, iface, mfi.thisptroffs, HookImpl::HookManPubFunc, &temp, post);
|
||||
return (*SH)->RemoveHook(*PL, iface, mfi.thisptroffs, HookCoreImpl::HookManPubFunc, &temp, post);
|
||||
}
|
||||
|
||||
protected:
|
||||
/**
|
||||
* @brief Configure the hookmangen for this hook manager
|
||||
*
|
||||
* @param store
|
||||
* @param hi
|
||||
* @return int Zero on success
|
||||
*/
|
||||
static int HookManPubFunc(bool store, ::SourceHook::IHookManagerInfo *hi)
|
||||
{
|
||||
// Build the MemberFuncInfo for the hooked method
|
||||
@ -912,155 +1115,184 @@ namespace SourceHook
|
||||
if (hi) {
|
||||
// Build a memberfuncinfo for our hook processor.
|
||||
MemFuncInfo our_mfi = {true, -1, 0, 0};
|
||||
GetFuncInfo(&HookImpl::Func, our_mfi);
|
||||
GetFuncInfo(&Parent::Hook, our_mfi);
|
||||
|
||||
void* us = reinterpret_cast<void **>(reinterpret_cast<char *>(&Instance) + our_mfi.vtbloffs)[our_mfi.vtblindex];
|
||||
hi->SetInfo(SH_HOOKMAN_VERSION, Instance.MFI.vtbloffs, Instance.MFI.vtblindex, &Instance.Proto, us);
|
||||
hi->SetInfo(SH_HOOKMAN_VERSION, Instance.MFI.vtbloffs, Instance.MFI.vtblindex, &Instance.HookHandler.Proto, us);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct IMyDelegate : ::SourceHook::ISHDelegate
|
||||
{
|
||||
virtual Result Call(Args... args) = 0;
|
||||
};
|
||||
|
||||
struct CMyDelegateImpl : IMyDelegate
|
||||
{
|
||||
Delegate _delegate;
|
||||
|
||||
CMyDelegateImpl(Delegate deleg) : _delegate(deleg)
|
||||
{}
|
||||
virtual~CMyDelegateImpl() {}
|
||||
Result Call(Args... args) { return _delegate(args...); }
|
||||
void DeleteThis() { delete this; }
|
||||
bool IsEqual(ISHDelegate *pOtherDeleg) { return _delegate == static_cast<CMyDelegateImpl *>(pOtherDeleg)->_delegate; }
|
||||
|
||||
};
|
||||
|
||||
protected:
|
||||
static Result InvokeDelegates(void* self, Args... args)
|
||||
{
|
||||
return HookHandlerImpl::template HookImplCore<SH, Invoker, Parent>(&Instance, self, args...);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief An object containing methods to safely handle the return type
|
||||
*
|
||||
* This allows us to safely handle zero-sized types as return values.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
detail::VoidMethodInvoker<SH, IMyDelegate, Args...>,
|
||||
detail::ReturningMethodInvoker<SH, IMyDelegate, Result, Args...>
|
||||
>::type Invoker;
|
||||
|
||||
/**
|
||||
* @brief An object containing a safely-allocatable return type
|
||||
*
|
||||
* Used when stack-allocating the return type;
|
||||
* void returns are never written to so using void* is safe.
|
||||
* when the return is not zero-sized, use the return itself.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
void*,
|
||||
Result
|
||||
>::type VoidSafeResult;
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief A return type that is C++-reference-safe.
|
||||
*
|
||||
* Prevents us from doing silly things with byref-passed values.
|
||||
*/
|
||||
typedef typename ReferenceCarrier<VoidSafeResult>::type ResultType;
|
||||
|
||||
// You're probably wondering what the hell this does.
|
||||
// https://stackoverflow.com/questions/11709859/how-to-have-static-data-members-in-a-header-only-library/11711082#11711082
|
||||
// I hate C++.
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename MemberMethod, ProtoInfo::CallConvention Convention, typename Parent, typename Result, typename... Args>
|
||||
Parent HookCoreImpl<SH, PL, Interface, Method, MemberMethod, Convention, Parent, Result, Args...>::Instance;
|
||||
|
||||
|
||||
/************************************************************************/
|
||||
/* Templated hook managers/argument lowering */
|
||||
/************************************************************************/
|
||||
|
||||
// How it works:
|
||||
//
|
||||
// C++ has no way to pass varargs to a lower method (unfortunately).
|
||||
// all we can do is give the lower method a pointer to our va_fmt object.
|
||||
// This is bad for us because it means there's no way to call the original method,
|
||||
// which requests varargs and not the va_fmt.
|
||||
//
|
||||
// To work around this, we introduce "argument lowering":
|
||||
// The hook managers (defined below) have the option to translate the
|
||||
// arguments passed to the method to an easier-to-use form for the
|
||||
// core implementation (defined above).
|
||||
//
|
||||
// Thus, the hook managers are simply responsible for packing and weird
|
||||
// or unorthodox arguments into a generally safe form, and then they are
|
||||
// responsible for unpacking these arguments back into their unsafe form
|
||||
// when it's time to call the original.
|
||||
//
|
||||
// To make your own hook manager, you need to do the following things:
|
||||
// - Inherit from HookCoreImpl<>, passing your (INCOMPLETE!) type as an argument for the
|
||||
// "Parent" typename in the HookCoreImpl template.
|
||||
// - Pass the LOWERED args to HookCoreImpl<>'s args thing!
|
||||
// - Pass the UNLOWERED/BAD SEMANTICS args to MemberMethod template param
|
||||
// - Expose a mfp "UnloweredDelegate" typename (aka, Method)
|
||||
// - Expose a "UnloweredSelf" typename (aka, interface)
|
||||
// - Expose a virtual Result Hook(ORIGINAL/UNSAFE ARGS HERE) method
|
||||
// - That calls return InvokeDelegates(this, SAFE ARGS PASSED TO HOOKCOREIMPL);
|
||||
// - Expose a static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args) method
|
||||
//
|
||||
// That's it, you're done!
|
||||
// As long as you don't invoke any undefined behavior while doing any of the above,
|
||||
// you should be able to get away with pretty much anything.
|
||||
//
|
||||
// As an example, the SourceHook FmtHookImpl below does the following operations:
|
||||
// - Passes <Args..., const char* buffer> as args to HookCoreImpl,
|
||||
// - Has a virtual Result Hook(Args..., const char* fmt, ...)
|
||||
// - That calls vsnprintf(buf, fmt, ...)
|
||||
// - That passes the result to InvokeUnlowered(Args..., buf);
|
||||
// - Exposes a InvokeUnlowered(self, mfp, args..., const char* buf)
|
||||
// - That calls self->mfp(args...,"%s", buf)
|
||||
// By using printf(buf, fmt, ...) and then passing "%s", buf to the original,
|
||||
// we've preserved semantics across the entire SourceHook call!
|
||||
//
|
||||
// I should probably be killed for writing this code, but life is short anyways.
|
||||
// TODO: Add manual hook support to all of this shenanigans
|
||||
|
||||
/**
|
||||
* @brief Non-vararg hook implementation
|
||||
*
|
||||
* Performs no argument lowering.
|
||||
*
|
||||
* @tparam SH A pointer to the SourceHook interface
|
||||
* @tparam PL A pointer to our PluginId
|
||||
* @tparam Interface The interface to hook
|
||||
* @tparam Method The interface method pointer to hook
|
||||
* @tparam Result The return type
|
||||
* @tparam Args All arguments passed to the original
|
||||
*/
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
|
||||
struct HookImpl : HookCoreImpl<
|
||||
SH, PL,
|
||||
Interface, Method, Result (Interface::*)(Args...), ProtoInfo::CallConv_ThisCall,
|
||||
HookImpl<SH, PL, Interface, Method, Result, Args...>,
|
||||
Result, Args...>
|
||||
{
|
||||
public:
|
||||
typedef Result (Interface::*UnloweredDelegate)(Args...);
|
||||
typedef Interface UnloweredSelf;
|
||||
|
||||
/**
|
||||
* @brief Hook handler virtual
|
||||
*/
|
||||
virtual Result Func(Args... args)
|
||||
virtual Result Hook(Args... args)
|
||||
{
|
||||
// Note to all ye who enter here:
|
||||
// Do not, do NOT--DO NOT: touch "this" or any of our member variables.
|
||||
// Hands off bucko. USE THE STATIC INSTANCE! (thisptr is undefined!!)
|
||||
using namespace ::SourceHook;
|
||||
|
||||
void *ourvfnptr = reinterpret_cast<void *>(
|
||||
*reinterpret_cast<void ***>(reinterpret_cast<char *>(this) + Instance.MFI.vtbloffs) + Instance.MFI.vtblindex);
|
||||
void *vfnptr_origentry;
|
||||
|
||||
META_RES status = MRES_IGNORED;
|
||||
META_RES prev_res;
|
||||
META_RES cur_res;
|
||||
|
||||
ResultType original_ret;
|
||||
ResultType override_ret;
|
||||
ResultType current_ret;
|
||||
|
||||
IMyDelegate *iter;
|
||||
IHookContext *context = (*SH)->SetupHookLoop(
|
||||
Instance.HI,
|
||||
ourvfnptr,
|
||||
reinterpret_cast<void *>(this),
|
||||
&vfnptr_origentry,
|
||||
&status,
|
||||
&prev_res,
|
||||
&cur_res,
|
||||
&original_ret,
|
||||
&override_ret);
|
||||
|
||||
// Call all pre-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<ResultType *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
// Call original method
|
||||
if (status != MRES_SUPERCEDE && context->ShouldCallOrig()) {
|
||||
typename Invoker::base::EmptyDelegate original;
|
||||
reinterpret_cast<void **>(&original)[0] = vfnptr_origentry;
|
||||
Invoker::Original( reinterpret_cast<EmptyClass*>(this), original, &original_ret, args...);
|
||||
} else {
|
||||
// TODO: Do we use context->GetOriginalRetPtr() here?
|
||||
// this is inherited from the macro versions to prevent semantic differences.
|
||||
original_ret = override_ret;
|
||||
}
|
||||
|
||||
// Call all post-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<VoidSafeResult *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
const ResultType* result_ptr = reinterpret_cast<const ResultType *>((status >= MRES_OVERRIDE)
|
||||
? context->GetOverrideRetPtr()
|
||||
: context->GetOrigRetPtr());
|
||||
|
||||
(*SH)->EndContext(context);
|
||||
|
||||
return Invoker::Dereference(result_ptr);
|
||||
return InvokeDelegates(this, args...);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Call the original method by raising our lowered arguments back to the originals
|
||||
* @param unlowered
|
||||
* @param args
|
||||
*/
|
||||
static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args)
|
||||
{
|
||||
return (self->*mfp)(args...);
|
||||
}
|
||||
public:
|
||||
static constexpr HookImpl* Make()
|
||||
{
|
||||
HookImpl::Instance = HookImpl();
|
||||
|
||||
return &HookImpl::Instance;
|
||||
}
|
||||
};
|
||||
|
||||
// You're probably wondering what the hell this does.
|
||||
// https://stackoverflow.com/questions/11709859/how-to-have-static-data-members-in-a-header-only-library/11711082#11711082
|
||||
// Yes, I also happen to hate C++.
|
||||
/**
|
||||
* @brief Format string hook implementation
|
||||
*
|
||||
* Lowers const char* fmt and ... into const char* buffer
|
||||
*
|
||||
* @tparam SH A pointer to the SourceHook interface
|
||||
* @tparam PL A pointer to our PluginId
|
||||
* @tparam Interface The interface to hook
|
||||
* @tparam Method The interface method pointer to hook
|
||||
* @tparam Result The return type
|
||||
* @tparam Args All arguments passed to the original, except the last const char* fmt and ...
|
||||
*/
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
|
||||
HookImpl<SH, PL, Interface, Method, Result, Args...> HookImpl<SH, PL, Interface, Method, Result, Args...>::Instance;
|
||||
struct FmtHookImpl : HookCoreImpl<
|
||||
SH, PL,
|
||||
Interface, Method, Result (Interface::*)(Args..., const char*, ...), ProtoInfo::CallConv_HasVafmt,
|
||||
FmtHookImpl<SH, PL, Interface, Method, Result, Args...>,
|
||||
Result, Args..., const char*>
|
||||
{
|
||||
typedef Result (Interface::*UnloweredDelegate)(Args..., const char*, ...);
|
||||
typedef Interface UnloweredSelf;
|
||||
|
||||
/**
|
||||
* @brief Hook handler virtual
|
||||
*/
|
||||
virtual Result Hook(Args... args, const char* fmt, ...)
|
||||
{
|
||||
char buf[::SourceHook::STRBUF_LEN];
|
||||
va_list ap;
|
||||
va_start(ap, fmt);
|
||||
vsnprintf(buf, sizeof(buf), fmt, ap);
|
||||
buf[sizeof(buf) - 1] = 0;
|
||||
va_end(ap);
|
||||
return InvokeDelegates(this, args..., buf);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Call the original method by raising our lowered arguments back to the originals
|
||||
* @param unlowered
|
||||
* @param args
|
||||
*/
|
||||
static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args, const char* buffer)
|
||||
{
|
||||
return (self->*mfp)(args..., "%s", buffer);
|
||||
}
|
||||
|
||||
public:
|
||||
static constexpr FmtHookImpl* Make()
|
||||
{
|
||||
FmtHookImpl::Instance = FmtHookImpl();
|
||||
|
||||
return &FmtHookImpl::Instance;
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
|
||||
@ -116,6 +116,7 @@
|
||||
|
||||
#define SH_PTRSIZE sizeof(void*)
|
||||
|
||||
#include <cstdarg>
|
||||
#include <type_traits>
|
||||
#include "sh_memfuncinfo.h"
|
||||
#include "FastDelegate.h"
|
||||
@ -665,6 +666,10 @@ namespace SourceHook
|
||||
* Original - call the original method and safely handle the return type
|
||||
* Dereference - dereference the return type pointer for hook return semantics
|
||||
*
|
||||
* OriginalRaised - a little special, we call a static func from the parent hook
|
||||
* manager class to raise lowered arguments passed to the core delegates. This is
|
||||
* used when the core delegates receive different args than the root proto (eg, varargs!)
|
||||
*
|
||||
*/
|
||||
template<ISourceHook** SourceHook, typename Result, typename... Args>
|
||||
struct BaseMethodInvoker
|
||||
@ -692,6 +697,13 @@ namespace SourceHook
|
||||
(self->*mfp)(args...);
|
||||
}
|
||||
|
||||
template<typename Self, typename Mfp>
|
||||
static void OriginalRaised( void (*Invoker)(Self, Mfp, Args...), Self self, Mfp mfp, void* result, Args... args )
|
||||
{
|
||||
// Do not touch return type: It's void!
|
||||
Invoker(self, mfp, args...);
|
||||
}
|
||||
|
||||
static void Dereference(const void* arg)
|
||||
{
|
||||
return;
|
||||
@ -716,11 +728,206 @@ namespace SourceHook
|
||||
*result = (self->*mfp)(args...);
|
||||
}
|
||||
|
||||
template<typename Self, typename Mfp>
|
||||
static void OriginalRaised( Result (*Invoker)(Self, Mfp, Args...), Self self, Mfp mfp, Result* result, Args... args )
|
||||
{
|
||||
*result = Invoker(self, mfp, args...);
|
||||
}
|
||||
|
||||
static Result Dereference(const Result* arg)
|
||||
{
|
||||
return *arg;
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief defines the interface from the hook manager -> user code
|
||||
*
|
||||
* This is invoked from the hook manager to call SourceHook delegates once
|
||||
* the hook manager has lowered arguments/etc into the receiving delegate types.
|
||||
*/
|
||||
template<ProtoInfo::CallConvention Convention, typename Result, typename... Args>
|
||||
struct HookHandlerImpl
|
||||
{
|
||||
public:
|
||||
/**
|
||||
* @brief The delegate type that SourceHook will invoke (user code)
|
||||
*/
|
||||
typedef typename fastdelegate::FastDelegate<Result, Args...> Delegate;
|
||||
|
||||
struct IMyDelegate : ::SourceHook::ISHDelegate
|
||||
{
|
||||
public:
|
||||
virtual Result Call(Args... args) = 0;
|
||||
};
|
||||
|
||||
struct CMyDelegateImpl : IMyDelegate
|
||||
{
|
||||
public:
|
||||
Delegate _delegate;
|
||||
|
||||
CMyDelegateImpl(Delegate deleg) : _delegate(deleg)
|
||||
{}
|
||||
virtual~CMyDelegateImpl() {}
|
||||
Result Call(Args... args) { return _delegate(args...); }
|
||||
void DeleteThis() { delete this; }
|
||||
bool IsEqual(ISHDelegate *pOtherDeleg) { return _delegate == static_cast<CMyDelegateImpl *>(pOtherDeleg)->_delegate; }
|
||||
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief An object containing a safely-allocatable return type
|
||||
*
|
||||
* Used when stack-allocating the return type;
|
||||
* void returns are never written to so using void* is safe.
|
||||
* when the return is not zero-sized, use the return itself.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
void*,
|
||||
Result
|
||||
>::type VoidSafeResult;
|
||||
|
||||
/**
|
||||
* @brief A return type that is C++-reference-safe.
|
||||
*
|
||||
* Prevents us from doing silly things with byref-passed values.
|
||||
*/
|
||||
typedef typename ReferenceCarrier<VoidSafeResult>::type ResultType;
|
||||
|
||||
::SourceHook::ProtoInfo Proto;
|
||||
|
||||
/**
|
||||
* @brief Build the ProtoInfo for this hook
|
||||
*/
|
||||
constexpr HookHandlerImpl()
|
||||
{
|
||||
// build protoinfo
|
||||
Proto.numOfParams = sizeof...(Args);
|
||||
Proto.convention = Convention;
|
||||
|
||||
if constexpr (std::is_void_v<Result>) {
|
||||
Proto.retPassInfo = {0, 0, 0};
|
||||
} else {
|
||||
Proto.retPassInfo = { sizeof(Result), ::SourceHook::GetPassInfo< Result >::type, ::SourceHook::GetPassInfo< Result >::flags };
|
||||
}
|
||||
|
||||
// Iterate over the args... type pack
|
||||
auto paramsPassInfo = new PassInfo[sizeof...(Args) + 1];
|
||||
paramsPassInfo[0] = { 1, 0, 0 };
|
||||
Proto.paramsPassInfo = paramsPassInfo;
|
||||
|
||||
detail::PrototypeBuilderFunctor argsBuilder(paramsPassInfo);
|
||||
metaprogramming::for_each_template_nullable<detail::PrototypeBuilderFunctor, Args...>(&argsBuilder);
|
||||
|
||||
|
||||
// Build the backwards compatible paramsPassInfoV2 field
|
||||
Proto.retPassInfo2 = {0, 0, 0, 0};
|
||||
auto paramsPassInfo2 = new PassInfo::V2Info[sizeof...(Args) + 1];
|
||||
Proto.paramsPassInfo2 = paramsPassInfo2;
|
||||
|
||||
for (int i = 0; i /* lte to include thisptr! */ <= sizeof...(Args); ++i) {
|
||||
paramsPassInfo2[i] = { 0, 0, 0, 0 };
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
template<ISourceHook** SH, typename Invoker, typename InstType>
|
||||
static Result HookImplCore(InstType* Instance, void* self, Args... args)
|
||||
{
|
||||
// Note to all ye who enter here:
|
||||
// Do not, do NOT--DO NOT: touch "this" or any of our member variables.
|
||||
// Hands off bucko. USE THE STATIC INSTANCE! (thisptr is undefined!!)
|
||||
using namespace ::SourceHook;
|
||||
|
||||
void *ourvfnptr = reinterpret_cast<void *>(
|
||||
*reinterpret_cast<void ***>(reinterpret_cast<char *>(self) + Instance->MFI.vtbloffs) + Instance->MFI.vtblindex);
|
||||
void *vfnptr_origentry;
|
||||
|
||||
META_RES status = MRES_IGNORED;
|
||||
META_RES prev_res;
|
||||
META_RES cur_res;
|
||||
|
||||
ResultType original_ret;
|
||||
ResultType override_ret;
|
||||
ResultType current_ret;
|
||||
|
||||
IMyDelegate *iter;
|
||||
IHookContext *context = (*SH)->SetupHookLoop(
|
||||
Instance->HI,
|
||||
ourvfnptr,
|
||||
reinterpret_cast<void *>(self),
|
||||
&vfnptr_origentry,
|
||||
&status,
|
||||
&prev_res,
|
||||
&cur_res,
|
||||
&original_ret,
|
||||
&override_ret);
|
||||
|
||||
// Call all pre-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<ResultType *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
// Call original method
|
||||
if (status != MRES_SUPERCEDE && context->ShouldCallOrig()) {
|
||||
typename Invoker::base::EmptyDelegate original;
|
||||
reinterpret_cast<void **>(&original)[0] = vfnptr_origentry;
|
||||
|
||||
// A little hacky, but I think this is probably the best way to go about this.
|
||||
// the parent ("InstType") is capable of lowering arguments for us; in other words,
|
||||
// they'll take tough ABI semantics like varargs and crunch them into an object we can
|
||||
// actually pass around. Unfortunately, that means we can't call the original delegate,
|
||||
// as then we'd be trying to give it the "lowered" argument that we gave it.
|
||||
//
|
||||
// To work around this, we've exposed the unlowered types to the implementation core here,
|
||||
// and we're going to give control of actually invoking the original to the hook manager
|
||||
// that actually lowered the args for us.
|
||||
//
|
||||
// These semantics are a little rough but it makes more sense from the parent-class side of things.
|
||||
|
||||
typename InstType::UnloweredSelf* known_self = reinterpret_cast<InstType::UnloweredSelf*>(self);
|
||||
typename InstType::UnloweredDelegate known_mfp = reinterpret_cast<InstType::UnloweredDelegate>(original);
|
||||
|
||||
Invoker::OriginalRaised( &InstType::InvokeUnlowered, known_self, known_mfp, &original_ret, args... );
|
||||
} else {
|
||||
// TODO: Do we use context->GetOriginalRetPtr() here?
|
||||
// this is inherited from the macro versions to prevent semantic differences.
|
||||
original_ret = override_ret;
|
||||
}
|
||||
|
||||
// Call all post-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<VoidSafeResult *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
const ResultType* result_ptr = reinterpret_cast<const ResultType *>((status >= MRES_OVERRIDE)
|
||||
? context->GetOverrideRetPtr()
|
||||
: context->GetOrigRetPtr());
|
||||
|
||||
(*SH)->EndContext(context);
|
||||
|
||||
return Invoker::Dereference(result_ptr);
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
@ -730,8 +937,8 @@ namespace SourceHook
|
||||
{
|
||||
public:
|
||||
HookInstance(ISourceHook** sh, int hookid)
|
||||
: SH(sh)
|
||||
, _hookid(hookid)
|
||||
: SH(sh)
|
||||
, _hookid(hookid)
|
||||
{}
|
||||
protected:
|
||||
// The global pointer to the SourceHook API
|
||||
@ -746,37 +953,25 @@ namespace SourceHook
|
||||
* @brief Returns true if the hook was successfully placed.
|
||||
* @return
|
||||
*/
|
||||
bool Ok()
|
||||
{
|
||||
return _hookid != 0;
|
||||
}
|
||||
bool Ok() { return _hookid != 0; }
|
||||
|
||||
/**
|
||||
* @brief Pause the hook, preventing it from being called until unpaused.
|
||||
* @return
|
||||
*/
|
||||
bool Pause()
|
||||
{
|
||||
return (*SH)->PauseHookByID(_hookid);
|
||||
}
|
||||
bool Pause() { return (*SH)->PauseHookByID(_hookid); }
|
||||
|
||||
/**
|
||||
* @brief Unpause the hook if it is currently paused
|
||||
* @return
|
||||
*/
|
||||
bool Unpause()
|
||||
{
|
||||
return (*SH)->UnpauseHookByID(_hookid);
|
||||
}
|
||||
bool Unpause() { return (*SH)->UnpauseHookByID(_hookid); }
|
||||
|
||||
/**
|
||||
* @brief Remove the hook, permanently preventing it from being invoked.
|
||||
* @return
|
||||
*/
|
||||
bool Remove()
|
||||
{
|
||||
return (*SH)->RemoveHookByID(_hookid);
|
||||
}
|
||||
bool Remove() { return (*SH)->RemoveHookByID(_hookid); }
|
||||
};
|
||||
|
||||
/**
|
||||
@ -786,79 +981,80 @@ namespace SourceHook
|
||||
* and prototype in the template arguments. Any derived class of the interface
|
||||
* can be hooked using this manager.
|
||||
*/
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
|
||||
struct HookImpl
|
||||
template<
|
||||
// SourceHook core
|
||||
ISourceHook** SH, Plugin* PL,
|
||||
// Hooked object
|
||||
typename Interface, auto Method,
|
||||
// Hooked object type
|
||||
typename MemberMethod, ProtoInfo::CallConvention Convention,
|
||||
// Parent where lowering will occur
|
||||
typename Parent,
|
||||
// Delegate type
|
||||
typename Result, typename... Args>
|
||||
struct HookCoreImpl
|
||||
{
|
||||
protected:
|
||||
typedef typename ::SourceHook::detail::HookHandlerImpl<Convention, Result, Args...> HookHandlerImpl;
|
||||
typedef typename HookHandlerImpl::Delegate Delegate;
|
||||
typedef typename HookHandlerImpl::IMyDelegate IMyDelegate;
|
||||
typedef typename HookHandlerImpl::CMyDelegateImpl CMyDelegateImpl;
|
||||
|
||||
friend HookHandlerImpl;
|
||||
|
||||
|
||||
/**
|
||||
* @brief An object containing methods to safely handle the return type
|
||||
*
|
||||
* This allows us to safely handle zero-sized types as return values.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
detail::VoidMethodInvoker<SH, IMyDelegate, Args...>,
|
||||
detail::ReturningMethodInvoker<SH, IMyDelegate, Result, Args...>
|
||||
>::type Invoker;
|
||||
|
||||
/**
|
||||
* @brief The type we expect the template arg "Method" to be.
|
||||
* Method is the MFP we will be hooking, so they need to be exact!
|
||||
*/
|
||||
typedef Result (Interface::*MemberMethod)(Args...);
|
||||
typedef fastdelegate::FastDelegate<Result, Args...> Delegate;
|
||||
// typedef Result (Interface::*MemberMethod)(Args...);
|
||||
typedef decltype(Method) MethodType;
|
||||
|
||||
static_assert( std::is_same<MethodType, MemberMethod>::type::value, "Mismatched template parameters!" );
|
||||
|
||||
// uh oh, Parent is technically uninitialized here.
|
||||
// should find a workaround, this would be nice to have.
|
||||
//static_assert( std::is_base_of<HookCoreImpl, Parent>::type::value, "Mismatched hookman parent type! (INTERNAL ERROR - REPORT THIS AS A BUG)");
|
||||
|
||||
|
||||
// Members
|
||||
::SourceHook::MemFuncInfo MFI;
|
||||
::SourceHook::IHookManagerInfo *HI;
|
||||
::SourceHook::ProtoInfo Proto;
|
||||
|
||||
HookHandlerImpl HookHandler;
|
||||
|
||||
// Singleton instance
|
||||
// Initialized below!
|
||||
static HookImpl Instance;
|
||||
static Parent Instance;
|
||||
|
||||
private:
|
||||
HookImpl(HookImpl& other) = delete;
|
||||
protected:
|
||||
HookCoreImpl(HookCoreImpl& other) = delete;
|
||||
|
||||
/**
|
||||
* @brief Build the ProtoInfo for this hook
|
||||
*/
|
||||
constexpr HookImpl()
|
||||
constexpr HookCoreImpl()
|
||||
// Build the ProtoInfo object
|
||||
: HookHandler(HookHandlerImpl())
|
||||
{
|
||||
// build protoinfo
|
||||
Proto.numOfParams = sizeof...(Args);
|
||||
Proto.convention = ProtoInfo::CallConv_Unknown;
|
||||
|
||||
if constexpr (std::is_void_v<Result>) {
|
||||
Proto.retPassInfo = {0, 0, 0};
|
||||
} else {
|
||||
Proto.retPassInfo = { sizeof(Result), ::SourceHook::GetPassInfo< Result >::type, ::SourceHook::GetPassInfo< Result >::flags };
|
||||
}
|
||||
|
||||
// Iterate over the args... type pack
|
||||
auto paramsPassInfo = new PassInfo[sizeof...(Args) + 1];
|
||||
paramsPassInfo[0] = { 1, 0, 0 };
|
||||
Proto.paramsPassInfo = paramsPassInfo;
|
||||
|
||||
detail::PrototypeBuilderFunctor argsBuilder(paramsPassInfo);
|
||||
metaprogramming::for_each_template_nullable<detail::PrototypeBuilderFunctor, Args...>(&argsBuilder);
|
||||
|
||||
|
||||
// Build the backwards compatible paramsPassInfoV2 field
|
||||
Proto.retPassInfo2 = {0, 0, 0, 0};
|
||||
auto paramsPassInfo2 = new PassInfo::V2Info[sizeof...(Args) + 1];
|
||||
Proto.paramsPassInfo2 = paramsPassInfo2;
|
||||
|
||||
for (int i = 0; i /* lte to include thisptr! */ <= sizeof...(Args); ++i) {
|
||||
paramsPassInfo2[i] = { 0, 0, 0, 0 };
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
public:
|
||||
static constexpr HookImpl* Make()
|
||||
{
|
||||
HookImpl::Instance = HookImpl();
|
||||
|
||||
return &HookImpl::Instance;
|
||||
}
|
||||
|
||||
public: // Public Interface
|
||||
|
||||
/**
|
||||
* @brief Add an instance of this hook to the specified interface
|
||||
*
|
||||
* @param id the g_PLID value for the plugin creating the hook
|
||||
* @param iface the interface pointer to hook
|
||||
* @param post true when post-hooking, false when pre-hooking.
|
||||
* @param handler the handler that will be called in place of the original method
|
||||
@ -869,19 +1065,19 @@ namespace SourceHook
|
||||
using namespace ::SourceHook;
|
||||
MemFuncInfo mfi = {true, -1, 0, 0};
|
||||
GetFuncInfo(Method, mfi);
|
||||
|
||||
if (mfi.thisptroffs < 0 || !mfi.isVirtual)
|
||||
return HookInstance(SH, 0);
|
||||
return {SH, false};
|
||||
|
||||
CMyDelegateImpl* delegate = new CMyDelegateImpl(handler);
|
||||
int id = (*SH)->AddHook(*PL, mode, iface, mfi.thisptroffs, HookImpl::HookManPubFunc, delegate, post);
|
||||
int id = (*SH)->AddHook(*PL, mode, iface, mfi.thisptroffs, HookCoreImpl::HookManPubFunc, delegate, post);
|
||||
|
||||
return HookInstance(SH, id);
|
||||
return {SH, id};
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Remove an existing hook handler from this interface
|
||||
*
|
||||
* @param id the g_PLID value for the plugin the hook was created under
|
||||
* @param iface the interface to be unhooked
|
||||
* @param post true if this was a post hook, false otherwise (pre-hook)
|
||||
* @param handler the handler that will be removed from this hook.
|
||||
@ -894,10 +1090,17 @@ namespace SourceHook
|
||||
|
||||
// Temporary delegate for .IsEqual() comparison.
|
||||
CMyDelegateImpl temp(handler);
|
||||
return (*SH)->RemoveHook(*PL, iface, mfi.thisptroffs, HookImpl::HookManPubFunc, &temp, post);
|
||||
return (*SH)->RemoveHook(*PL, iface, mfi.thisptroffs, HookCoreImpl::HookManPubFunc, &temp, post);
|
||||
}
|
||||
|
||||
protected:
|
||||
/**
|
||||
* @brief Configure the hookmangen for this hook manager
|
||||
*
|
||||
* @param store
|
||||
* @param hi
|
||||
* @return int Zero on success
|
||||
*/
|
||||
static int HookManPubFunc(bool store, ::SourceHook::IHookManagerInfo *hi)
|
||||
{
|
||||
// Build the MemberFuncInfo for the hooked method
|
||||
@ -912,155 +1115,184 @@ namespace SourceHook
|
||||
if (hi) {
|
||||
// Build a memberfuncinfo for our hook processor.
|
||||
MemFuncInfo our_mfi = {true, -1, 0, 0};
|
||||
GetFuncInfo(&HookImpl::Func, our_mfi);
|
||||
GetFuncInfo(&Parent::Hook, our_mfi);
|
||||
|
||||
void* us = reinterpret_cast<void **>(reinterpret_cast<char *>(&Instance) + our_mfi.vtbloffs)[our_mfi.vtblindex];
|
||||
hi->SetInfo(SH_HOOKMAN_VERSION, Instance.MFI.vtbloffs, Instance.MFI.vtblindex, &Instance.Proto, us);
|
||||
hi->SetInfo(SH_HOOKMAN_VERSION, Instance.MFI.vtbloffs, Instance.MFI.vtblindex, &Instance.HookHandler.Proto, us);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct IMyDelegate : ::SourceHook::ISHDelegate
|
||||
{
|
||||
virtual Result Call(Args... args) = 0;
|
||||
};
|
||||
|
||||
struct CMyDelegateImpl : IMyDelegate
|
||||
{
|
||||
Delegate _delegate;
|
||||
|
||||
CMyDelegateImpl(Delegate deleg) : _delegate(deleg)
|
||||
{}
|
||||
virtual~CMyDelegateImpl() {}
|
||||
Result Call(Args... args) { return _delegate(args...); }
|
||||
void DeleteThis() { delete this; }
|
||||
bool IsEqual(ISHDelegate *pOtherDeleg) { return _delegate == static_cast<CMyDelegateImpl *>(pOtherDeleg)->_delegate; }
|
||||
|
||||
};
|
||||
|
||||
protected:
|
||||
static Result InvokeDelegates(void* self, Args... args)
|
||||
{
|
||||
return HookHandlerImpl::template HookImplCore<SH, Invoker, Parent>(&Instance, self, args...);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief An object containing methods to safely handle the return type
|
||||
*
|
||||
* This allows us to safely handle zero-sized types as return values.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
detail::VoidMethodInvoker<SH, IMyDelegate, Args...>,
|
||||
detail::ReturningMethodInvoker<SH, IMyDelegate, Result, Args...>
|
||||
>::type Invoker;
|
||||
|
||||
/**
|
||||
* @brief An object containing a safely-allocatable return type
|
||||
*
|
||||
* Used when stack-allocating the return type;
|
||||
* void returns are never written to so using void* is safe.
|
||||
* when the return is not zero-sized, use the return itself.
|
||||
*/
|
||||
typedef typename metaprogramming::if_else<
|
||||
std::is_void<Result>::value,
|
||||
void*,
|
||||
Result
|
||||
>::type VoidSafeResult;
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief A return type that is C++-reference-safe.
|
||||
*
|
||||
* Prevents us from doing silly things with byref-passed values.
|
||||
*/
|
||||
typedef typename ReferenceCarrier<VoidSafeResult>::type ResultType;
|
||||
|
||||
// You're probably wondering what the hell this does.
|
||||
// https://stackoverflow.com/questions/11709859/how-to-have-static-data-members-in-a-header-only-library/11711082#11711082
|
||||
// I hate C++.
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename MemberMethod, ProtoInfo::CallConvention Convention, typename Parent, typename Result, typename... Args>
|
||||
Parent HookCoreImpl<SH, PL, Interface, Method, MemberMethod, Convention, Parent, Result, Args...>::Instance;
|
||||
|
||||
|
||||
/************************************************************************/
|
||||
/* Templated hook managers/argument lowering */
|
||||
/************************************************************************/
|
||||
|
||||
// How it works:
|
||||
//
|
||||
// C++ has no way to pass varargs to a lower method (unfortunately).
|
||||
// all we can do is give the lower method a pointer to our va_fmt object.
|
||||
// This is bad for us because it means there's no way to call the original method,
|
||||
// which requests varargs and not the va_fmt.
|
||||
//
|
||||
// To work around this, we introduce "argument lowering":
|
||||
// The hook managers (defined below) have the option to translate the
|
||||
// arguments passed to the method to an easier-to-use form for the
|
||||
// core implementation (defined above).
|
||||
//
|
||||
// Thus, the hook managers are simply responsible for packing and weird
|
||||
// or unorthodox arguments into a generally safe form, and then they are
|
||||
// responsible for unpacking these arguments back into their unsafe form
|
||||
// when it's time to call the original.
|
||||
//
|
||||
// To make your own hook manager, you need to do the following things:
|
||||
// - Inherit from HookCoreImpl<>, passing your (INCOMPLETE!) type as an argument for the
|
||||
// "Parent" typename in the HookCoreImpl template.
|
||||
// - Pass the LOWERED args to HookCoreImpl<>'s args thing!
|
||||
// - Pass the UNLOWERED/BAD SEMANTICS args to MemberMethod template param
|
||||
// - Expose a mfp "UnloweredDelegate" typename (aka, Method)
|
||||
// - Expose a "UnloweredSelf" typename (aka, interface)
|
||||
// - Expose a virtual Result Hook(ORIGINAL/UNSAFE ARGS HERE) method
|
||||
// - That calls return InvokeDelegates(this, SAFE ARGS PASSED TO HOOKCOREIMPL);
|
||||
// - Expose a static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args) method
|
||||
//
|
||||
// That's it, you're done!
|
||||
// As long as you don't invoke any undefined behavior while doing any of the above,
|
||||
// you should be able to get away with pretty much anything.
|
||||
//
|
||||
// As an example, the SourceHook FmtHookImpl below does the following operations:
|
||||
// - Passes <Args..., const char* buffer> as args to HookCoreImpl,
|
||||
// - Has a virtual Result Hook(Args..., const char* fmt, ...)
|
||||
// - That calls vsnprintf(buf, fmt, ...)
|
||||
// - That passes the result to InvokeUnlowered(Args..., buf);
|
||||
// - Exposes a InvokeUnlowered(self, mfp, args..., const char* buf)
|
||||
// - That calls self->mfp(args...,"%s", buf)
|
||||
// By using printf(buf, fmt, ...) and then passing "%s", buf to the original,
|
||||
// we've preserved semantics across the entire SourceHook call!
|
||||
//
|
||||
// I should probably be killed for writing this code, but life is short anyways.
|
||||
// TODO: Add manual hook support to all of this shenanigans
|
||||
|
||||
/**
|
||||
* @brief Non-vararg hook implementation
|
||||
*
|
||||
* Performs no argument lowering.
|
||||
*
|
||||
* @tparam SH A pointer to the SourceHook interface
|
||||
* @tparam PL A pointer to our PluginId
|
||||
* @tparam Interface The interface to hook
|
||||
* @tparam Method The interface method pointer to hook
|
||||
* @tparam Result The return type
|
||||
* @tparam Args All arguments passed to the original
|
||||
*/
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
|
||||
struct HookImpl : HookCoreImpl<
|
||||
SH, PL,
|
||||
Interface, Method, Result (Interface::*)(Args...), ProtoInfo::CallConv_ThisCall,
|
||||
HookImpl<SH, PL, Interface, Method, Result, Args...>,
|
||||
Result, Args...>
|
||||
{
|
||||
public:
|
||||
typedef Result (Interface::*UnloweredDelegate)(Args...);
|
||||
typedef Interface UnloweredSelf;
|
||||
|
||||
/**
|
||||
* @brief Hook handler virtual
|
||||
*/
|
||||
virtual Result Func(Args... args)
|
||||
virtual Result Hook(Args... args)
|
||||
{
|
||||
// Note to all ye who enter here:
|
||||
// Do not, do NOT--DO NOT: touch "this" or any of our member variables.
|
||||
// Hands off bucko. USE THE STATIC INSTANCE! (thisptr is undefined!!)
|
||||
using namespace ::SourceHook;
|
||||
|
||||
void *ourvfnptr = reinterpret_cast<void *>(
|
||||
*reinterpret_cast<void ***>(reinterpret_cast<char *>(this) + Instance.MFI.vtbloffs) + Instance.MFI.vtblindex);
|
||||
void *vfnptr_origentry;
|
||||
|
||||
META_RES status = MRES_IGNORED;
|
||||
META_RES prev_res;
|
||||
META_RES cur_res;
|
||||
|
||||
ResultType original_ret;
|
||||
ResultType override_ret;
|
||||
ResultType current_ret;
|
||||
|
||||
IMyDelegate *iter;
|
||||
IHookContext *context = (*SH)->SetupHookLoop(
|
||||
Instance.HI,
|
||||
ourvfnptr,
|
||||
reinterpret_cast<void *>(this),
|
||||
&vfnptr_origentry,
|
||||
&status,
|
||||
&prev_res,
|
||||
&cur_res,
|
||||
&original_ret,
|
||||
&override_ret);
|
||||
|
||||
// Call all pre-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<ResultType *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
// Call original method
|
||||
if (status != MRES_SUPERCEDE && context->ShouldCallOrig()) {
|
||||
typename Invoker::base::EmptyDelegate original;
|
||||
reinterpret_cast<void **>(&original)[0] = vfnptr_origentry;
|
||||
Invoker::Original( reinterpret_cast<EmptyClass*>(this), original, &original_ret, args...);
|
||||
} else {
|
||||
// TODO: Do we use context->GetOriginalRetPtr() here?
|
||||
// this is inherited from the macro versions to prevent semantic differences.
|
||||
original_ret = override_ret;
|
||||
}
|
||||
|
||||
// Call all post-hooks
|
||||
prev_res = MRES_IGNORED;
|
||||
while ((iter = static_cast<IMyDelegate *>(context->GetNext()))) {
|
||||
cur_res = MRES_IGNORED;
|
||||
Invoker::Invoke(iter, ¤t_ret, args...);
|
||||
prev_res = cur_res;
|
||||
|
||||
if (cur_res > status)
|
||||
status = cur_res;
|
||||
|
||||
if (cur_res >= MRES_OVERRIDE)
|
||||
*reinterpret_cast<VoidSafeResult *>(context->GetOverrideRetPtr()) = current_ret;
|
||||
}
|
||||
|
||||
const ResultType* result_ptr = reinterpret_cast<const ResultType *>((status >= MRES_OVERRIDE)
|
||||
? context->GetOverrideRetPtr()
|
||||
: context->GetOrigRetPtr());
|
||||
|
||||
(*SH)->EndContext(context);
|
||||
|
||||
return Invoker::Dereference(result_ptr);
|
||||
return InvokeDelegates(this, args...);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Call the original method by raising our lowered arguments back to the originals
|
||||
* @param unlowered
|
||||
* @param args
|
||||
*/
|
||||
static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args)
|
||||
{
|
||||
return (self->*mfp)(args...);
|
||||
}
|
||||
public:
|
||||
static constexpr HookImpl* Make()
|
||||
{
|
||||
HookImpl::Instance = HookImpl();
|
||||
|
||||
return &HookImpl::Instance;
|
||||
}
|
||||
};
|
||||
|
||||
// You're probably wondering what the hell this does.
|
||||
// https://stackoverflow.com/questions/11709859/how-to-have-static-data-members-in-a-header-only-library/11711082#11711082
|
||||
// Yes, I also happen to hate C++.
|
||||
/**
|
||||
* @brief Format string hook implementation
|
||||
*
|
||||
* Lowers const char* fmt and ... into const char* buffer
|
||||
*
|
||||
* @tparam SH A pointer to the SourceHook interface
|
||||
* @tparam PL A pointer to our PluginId
|
||||
* @tparam Interface The interface to hook
|
||||
* @tparam Method The interface method pointer to hook
|
||||
* @tparam Result The return type
|
||||
* @tparam Args All arguments passed to the original, except the last const char* fmt and ...
|
||||
*/
|
||||
template<ISourceHook** SH, Plugin* PL, typename Interface, auto Method, typename Result, typename... Args>
|
||||
HookImpl<SH, PL, Interface, Method, Result, Args...> HookImpl<SH, PL, Interface, Method, Result, Args...>::Instance;
|
||||
struct FmtHookImpl : HookCoreImpl<
|
||||
SH, PL,
|
||||
Interface, Method, Result (Interface::*)(Args..., const char*, ...), ProtoInfo::CallConv_HasVafmt,
|
||||
FmtHookImpl<SH, PL, Interface, Method, Result, Args...>,
|
||||
Result, Args..., const char*>
|
||||
{
|
||||
typedef Result (Interface::*UnloweredDelegate)(Args..., const char*, ...);
|
||||
typedef Interface UnloweredSelf;
|
||||
|
||||
/**
|
||||
* @brief Hook handler virtual
|
||||
*/
|
||||
virtual Result Hook(Args... args, const char* fmt, ...)
|
||||
{
|
||||
char buf[::SourceHook::STRBUF_LEN];
|
||||
va_list ap;
|
||||
va_start(ap, fmt);
|
||||
vsnprintf(buf, sizeof(buf), fmt, ap);
|
||||
buf[sizeof(buf) - 1] = 0;
|
||||
va_end(ap);
|
||||
return InvokeDelegates(this, args..., buf);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Call the original method by raising our lowered arguments back to the originals
|
||||
* @param unlowered
|
||||
* @param args
|
||||
*/
|
||||
static Result InvokeUnlowered(UnloweredSelf* self, UnloweredDelegate mfp, Args... args, const char* buffer)
|
||||
{
|
||||
return (self->*mfp)(args..., "%s", buffer);
|
||||
}
|
||||
|
||||
public:
|
||||
static constexpr FmtHookImpl* Make()
|
||||
{
|
||||
FmtHookImpl::Instance = FmtHookImpl();
|
||||
|
||||
return &FmtHookImpl::Instance;
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user