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HLMetaModOfficial/core/sourcehook/sourcehook.cpp

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/* ======== SourceHook ========
* vim: set ts=4 sw=4 tw=99 noet:
* Copyright (C) 2004-2010 Metamod:Source Development Team
* No warranties of any kind
*
* License: zlib/libpng
*
* Author(s): Pavol "PM OnoTo" Marko
* Contributors: Scott "Damaged Soul" Ehlert
* ============================
*/
/**
* @file sourcehook.cpp
* @brief Contains the implementation of the SourceHook API
*/
#if defined __GNUC__
#include <stdint.h>
#endif
#include "sourcehook_impl.h"
namespace SourceHook
{
template<>
int HashFunction<int>(const int & k)
{
return k;
}
template<>
int Compare<int>(const int & k1, const int & k2)
{
if (k1 == k2)
return 0;
if (k1 > k2)
return 1;
if (k1 < k2)
return -1;
return 0;
}
namespace Impl
{
// Log level
SH_LOG sh_log_level = SH_LOG::NONE;
//////////////////////////////////////////////////////////////////////////
// CVfnPtrList
//////////////////////////////////////////////////////////////////////////
CVfnPtr *CVfnPtrList::GetVfnPtr(void *vfnptr)
{
iterator iter = find(vfnptr);
if (iter == end())
{
// No vfnptr info object found
// --> create a new one
CVfnPtr newVfnPtr(vfnptr);
if (newVfnPtr.Init())
{
push_back(newVfnPtr);
return &(back());
}
else
{
// Initialization failed.
return NULL;
}
}
else
{
return &(*iter);
}
}
//////////////////////////////////////////////////////////////////////////
// CSourceHookImpl
//////////////////////////////////////////////////////////////////////////
CSourceHookImpl::CSourceHookImpl(DebugLogFunc logfunc)
{
m_LogFunc = logfunc;
}
CSourceHookImpl::~CSourceHookImpl()
{
CompleteShutdown();
}
int CSourceHookImpl::GetIfaceVersion()
{
return SH_IFACE_VERSION;
}
int CSourceHookImpl::GetImplVersion()
{
return SH_IMPL_VERSION;
}
int CSourceHookImpl::AddHook(Plugin plug, AddHookMode mode, void *iface, int thisptr_offs, HookManagerPubFunc myHookMan,
ISHDelegate *handler, bool post)
{
if (mode != Hook_Normal && mode != Hook_VP && mode != Hook_DVP)
return 0;
// Get info about hook manager
CHookManager hookManager(plug, myHookMan);
if (!hookManager)
return 0;
void *adjustediface = NULL;
void **cur_vtptr = NULL;
void *cur_vfnptr = NULL;
// find vfnptr
switch (mode)
{
case Hook_Normal:
adjustediface = reinterpret_cast<void*>(reinterpret_cast<char*>(iface) + thisptr_offs);
cur_vtptr = *reinterpret_cast<void***>(
reinterpret_cast<char*>(adjustediface) + hookManager.GetVtblOffs());
cur_vfnptr = reinterpret_cast<void*>(cur_vtptr + hookManager.GetVtblIdx());
break;
case Hook_VP:
adjustediface = reinterpret_cast<void*>(reinterpret_cast<char*>(iface) + thisptr_offs);
cur_vtptr = *reinterpret_cast<void***>(
reinterpret_cast<char*>(adjustediface) + hookManager.GetVtblOffs());
cur_vfnptr = reinterpret_cast<void*>(cur_vtptr + hookManager.GetVtblIdx());
adjustediface = NULL;
break;
case Hook_DVP:
adjustediface = NULL;
cur_vtptr = reinterpret_cast<void**>(iface);
cur_vfnptr = cur_vtptr + hookManager.GetVtblIdx();
break;
}
CVfnPtr *vfnPtr = m_VfnPtrs.GetVfnPtr(cur_vfnptr);
if (!vfnPtr)
{
// Could not create the vfnptr info object.
// This could be because a thunk generation on GCC
// has failed. See sourcehook_impl_cvfnptr.cpp
// for details.
return false;
}
vfnPtr->AddHookMan(m_HookManList.GetHookMan(hookManager));
CIface &ifaceinst = vfnPtr->GetIface(adjustediface);
// Add the hook
CHook hook(plug, thisptr_offs, handler,
m_HookIDMan.New(hookManager.GetProto(), hookManager.GetVtblOffs(), hookManager.GetVtblIdx(),
cur_vfnptr, adjustediface, plug, thisptr_offs, handler, post)
);
if (post)
ifaceinst.GetPostHookList().push_back(hook);
else
ifaceinst.GetPreHookList().push_back(hook);
return hook.GetID();
}
bool CSourceHookImpl::RemoveHook(Plugin plug, void *iface, int thisptr_offs, HookManagerPubFunc myHookMan,
ISHDelegate *handler, bool post)
{
// Get info about hook manager and compute adjustediface
CHookManager tmpHookMan(plug, myHookMan);
void *adjustediface = reinterpret_cast<void*>(reinterpret_cast<char*>(iface)+thisptr_offs);
// Loop through all hooks and remove those which match:
// hookman, vfnptr, iface, plug, adjusted iface, this ptr offs, handler, post
CVector<int> removehooks;
m_HookIDMan.FindAllHooks(removehooks, tmpHookMan.GetProto(), tmpHookMan.GetVtblOffs(), tmpHookMan.GetVtblIdx(),
adjustediface, plug, thisptr_offs, handler, post);
if (removehooks.empty())
return false;
bool status = false;
for (CVector<int>::iterator iter = removehooks.begin(); iter != removehooks.end(); ++iter)
{
if (RemoveHookByID(*iter))
status = true;
}
return status;
}
bool CSourceHookImpl::RemoveHookByID(int hookid)
{
const CHookIDManager::Entry *hentry;
hentry = m_HookIDMan.QueryHook(hookid);
if (!hentry)
{
// hookid doesn't exist !
return false;
}
// find vfnptr
List<CVfnPtr>::iterator vfnptr_iter = m_VfnPtrs.find(hentry->vfnptr);
if (vfnptr_iter == m_VfnPtrs.end())
return false;
// find iface
List<CIface>::iterator iface_iter = vfnptr_iter->GetIfaceList().find(hentry->adjustediface);
if (iface_iter == vfnptr_iter->GetIfaceList().end())
return false;
// find hook
List<CHook> &hooks = hentry->post ? iface_iter->GetPostHookList() : iface_iter->GetPreHookList();
List<CHook>::iterator hook_iter = hooks.find(hookid);
if (hook_iter == hooks.end())
return false;
hook_iter->GetHandler()->DeleteThis();
// Iterator movage!
List<CHook>::iterator oldhookiter = hook_iter;
hook_iter = hooks.erase(hook_iter);
for (CStack<CHookContext>::iterator ctx_iter = m_ContextStack.begin();
ctx_iter != m_ContextStack.end(); ++ctx_iter)
{
ctx_iter->HookRemoved(oldhookiter, hook_iter);
}
if (iface_iter->GetPreHookList().empty() && iface_iter->GetPostHookList().empty())
{
// -> Kill all contexts that use it!
for (CStack<CHookContext>::iterator ctx_iter = m_ContextStack.begin();
ctx_iter != m_ContextStack.end(); ++ctx_iter)
{
ctx_iter->IfaceRemoved(&(*iface_iter));
}
// There are no hooks on this iface anymore...
iface_iter = vfnptr_iter->GetIfaceList().erase(iface_iter);
if (vfnptr_iter->GetIfaceList().empty())
{
// No ifaces at all -> Deactivate the hook
for (CStack<CHookContext>::iterator ctx_iter = m_ContextStack.begin();
ctx_iter != m_ContextStack.end(); ++ctx_iter)
{
ctx_iter->VfnPtrRemoved(&(*vfnptr_iter));
}
RevertAndRemoveVfnPtr(vfnptr_iter);
}
}
m_HookIDMan.Remove(hookid);
return true;
}
List<CVfnPtr>::iterator CSourceHookImpl::RevertAndRemoveVfnPtr(List<CVfnPtr>::iterator vfnptr_iter)
{
ICleanupTask *cleanupTask = vfnptr_iter->GetCleanupTask();
// Some vfnptrs require cleanup.
// Concrete case: on GCC, when the original vtable entry is not even
// we generate an even-aligned thunk to call the original function.
// If the vfnptr is being removed from a pre hook on the vfnptr
// we have to delay the cleanup of this thunk until the hook loop is done
// (because the orig function call mechanism is going to use the thunk).
if (cleanupTask != NULL)
{
// If this vfnptr is in use in one of the hook loops running at the moment
// Schedule it for removal on the DEEPEST hook loop.
size_t numOfContexts = m_ContextStack.size();
// m_ContextStack.at(0) is the deepest hook context
// m_ContextStack.at(size-1) = m_ContextStack.front is the uppermost
bool cleanupImmedieately = true;
CVfnPtr *vfnPtrObjAddr = &(*vfnptr_iter);
for (size_t i = 0; i < numOfContexts; ++i)
{
CHookContext &context = m_ContextStack.at(i);
if (context.pVfnPtr == vfnPtrObjAddr)
{
// Found a hook context using this vfnptr at the moment.
context.m_CleanupTask = cleanupTask;
cleanupImmedieately = false; // Delay the cleanup
break;
}
}
if (cleanupImmedieately)
{
cleanupTask->CleanupAndDeleteThis();
}
}
// Do the work
vfnptr_iter->Revert();
return m_VfnPtrs.erase(vfnptr_iter);
}
void CSourceHookImpl::SetRes(META_RES res)
{
*m_ContextStack.front().pCurRes = res;
}
META_RES CSourceHookImpl::GetPrevRes()
{
return *m_ContextStack.front().pPrevRes;
}
META_RES CSourceHookImpl::GetStatus()
{
return *m_ContextStack.front().pStatus;
}
const void *CSourceHookImpl::GetOrigRet()
{
return m_ContextStack.front().pOrigRet;
}
const void *CSourceHookImpl::GetOverrideRet()
{
return (*m_ContextStack.front().pStatus < MRES_OVERRIDE) ?
NULL : m_ContextStack.front().pOverrideRet;
}
void *CSourceHookImpl::GetIfacePtr()
{
// If in recall: return last one
if (m_ContextStack.front().m_State >= CHookContext::State_Recall_Pre &&
m_ContextStack.front().m_State <= CHookContext::State_Recall_PostVP)
{
return m_ContextStack.second().pIfacePtr;
}
else
{
return m_ContextStack.front().pIfacePtr;
}
}
void *CSourceHookImpl::GetOverrideRetPtr()
{
return m_ContextStack.front().pOverrideRet;
}
void CSourceHookImpl::UnloadPlugin(Plugin plug, UnloadListener *listener)
{
// 1) Remove all hooks by this plugin
CVector<int> removehooks;
m_HookIDMan.FindAllHooks(removehooks, plug);
for (CVector<int>::iterator iter = removehooks.begin(); iter != removehooks.end(); ++iter)
RemoveHookByID(*iter);
// 2) Remove all hook managers
for (CHookManList::iterator iter = m_HookManList.begin(); iter != m_HookManList.end(); )
{
if (iter->GetOwnerPlugin() == plug)
iter = RemoveHookManager(iter);
else
++iter;
}
// Fix for bug 5034. It's pretty tricky to find whether hookmanagers owned by this
// plugin are active. We could change how hook managers are tracked in SH, and lazily
// free them as the context stack drops to 0, or we could change the pubfunc API to
// know whether it's active or not. Rather than deal with this extra complexity, we
// just conservatively wait until the context stack hits 0 before unloading.
if (m_ContextStack.size() == 0)
{
listener->ReadyToUnload(plug);
}
else
{
m_PendingUnloads.push_back(new PendingUnload(listener, plug));
}
}
CHookManList::iterator CSourceHookImpl::RemoveHookManager(CHookManList::iterator hookman_iter)
{
// 2) Remove it
for (CVfnPtrList::iterator vfnptr_iter = m_VfnPtrs.begin();
vfnptr_iter != m_VfnPtrs.end();)
{
if (!vfnptr_iter->HookManRemoved(&(*hookman_iter)))
{
// This vfnptr has no more hook managers
// and asks to be removed.
m_HookIDMan.RemoveAll(vfnptr_iter->GetPtr());
vfnptr_iter = RevertAndRemoveVfnPtr(vfnptr_iter);
}
else
{
++vfnptr_iter;
}
}
return m_HookManList.erase(hookman_iter);
}
void CSourceHookImpl::RemoveHookManager(Plugin plug, HookManagerPubFunc pubFunc)
{
// Find the hook manager
CHookManList::iterator hookman_iter = m_HookManList.find(CHookManager::Descriptor(plug, pubFunc));
if (hookman_iter != m_HookManList.end())
{
RemoveHookManager(hookman_iter);
}
}
void CSourceHookImpl::SetIgnoreHooks(void *vfnptr)
{
CHookContext ctx;
ctx.m_State = CHookContext::State_Ignore;
m_ContextStack.push(ctx);
}
void CSourceHookImpl::ResetIgnoreHooks(void *vfnptr)
{
if (!m_ContextStack.empty() && m_ContextStack.front().m_State == CHookContext::State_Ignore)
{
// Actually use EndContext
// instead of m_ContextStack.pop directly
// because it runs the cleanup task if neccesary
EndContext(&(m_ContextStack.front()));
}
}
void *CSourceHookImpl::GetOrigVfnPtrEntry(void *vfnptr)
{
for (CVfnPtrList::iterator vfnptr_iter = m_VfnPtrs.begin(); vfnptr_iter != m_VfnPtrs.end(); ++vfnptr_iter)
{
if (vfnptr_iter->GetPtr() == vfnptr)
return vfnptr_iter->GetOrigEntry();
}
return NULL;
}
void CSourceHookImpl::DoRecall()
{
CHookContext newCtx;
CHookContext &curCtx = m_ContextStack.front();
newCtx.m_State = curCtx.m_State + (CHookContext::State_Recall_Pre - CHookContext::State_Pre);
if (newCtx.m_State == CHookContext::State_Recall_Post || newCtx.m_State == CHookContext::State_Recall_PostVP)
{
// Also save orig ret
newCtx.pOrigRet = curCtx.pOrigRet;
}
// The hookfunc usually does this, but it won't have a chance to see it,
// so for recalls, we update status here if it's required
if (*curCtx.pCurRes > *curCtx.pStatus)
*curCtx.pStatus = *curCtx.pCurRes;
newCtx.pStatus = curCtx.pStatus;
newCtx.pOverrideRet = curCtx.pOverrideRet;
newCtx.pPrevRes = curCtx.pPrevRes;
newCtx.m_Iter = curCtx.m_Iter;
// Take this with us!
newCtx.pCurRes = curCtx.pCurRes;
m_ContextStack.push(newCtx);
curCtx.m_State = CHookContext::State_Dead;
}
IHookContext *CSourceHookImpl::SetupHookLoop(IHookManagerInfo *hi, void *vfnptr, void *thisptr, void **origCallAddr, META_RES *statusPtr,
META_RES *prevResPtr, META_RES *curResPtr, const void *origRetPtr, void *overrideRetPtr)
{
SH_DEBUG_LOG(VERBOSE, "CSourceHookImpl(%p)::SetupHookLoop\n"
"- hi %p\n"
"- vfnptr %p\n"
"- thisptr %p\n"
"- origCallAddr %p\n"
"- statusPtr %p\n"
"- prevResPtr %p\n"
"- curResPtr %p\n"
"- origRetPtr %p\n"
"- overrideRetPtr %p",
(void*)this, (void*)hi, (void*)vfnptr, (void*)thisptr, (void*)origCallAddr, (void*)statusPtr, (void*)prevResPtr, (void*)curResPtr, (void*)origRetPtr, (void*)overrideRetPtr);
CHookContext *pCtx = NULL;
CHookContext *oldctx = m_ContextStack.empty() ? NULL : &m_ContextStack.front();
if (oldctx)
{
// SH_CALL
if (oldctx->m_State == CHookContext::State_Ignore)
{
*statusPtr = MRES_IGNORED;
oldctx->m_CallOrig = true;
oldctx->m_State = CHookContext::State_Dead;
List<CVfnPtr*> &vfnptr_list = static_cast<CHookManager*>(hi)->GetVfnPtrList();
List<CVfnPtr*>::iterator vfnptr_iter;
for (vfnptr_iter = vfnptr_list.begin();
vfnptr_iter != vfnptr_list.end(); ++vfnptr_iter)
{
if (**vfnptr_iter == vfnptr)
break;
}
if (vfnptr_iter == vfnptr_list.end())
{
SH_ASSERT(false, ("How can a hook exist on a vfnptr which we don't have in our db?!"));
}
else
{
*origCallAddr = (*vfnptr_iter)->GetOrigCallAddr();
oldctx->pVfnPtr = *vfnptr_iter;
}
oldctx->pOrigRet = origRetPtr;
return oldctx;
}
// Recall
else if (oldctx->m_State >= CHookContext::State_Recall_Pre &&
oldctx->m_State <= CHookContext::State_Recall_PostVP)
{
pCtx = oldctx;
*statusPtr = *(oldctx->pStatus);
*prevResPtr = *(oldctx->pPrevRes);
pCtx->m_Iter = oldctx->m_Iter;
// Only have possibility of calling the orig func in pre recall mode
pCtx->m_CallOrig = (oldctx->m_State == CHookContext::State_Recall_Pre ||
oldctx->m_State == CHookContext::State_Recall_PreVP);
overrideRetPtr = pCtx->pOverrideRet;
// When the status is low so there's no override return value and we're in a post recall,
// give it the orig return value as override return value.
if (pCtx->m_State == CHookContext::State_Recall_Post ||
pCtx->m_State == CHookContext::State_Recall_PostVP)
{
origRetPtr = oldctx->pOrigRet;
if (*statusPtr < MRES_OVERRIDE)
overrideRetPtr = const_cast<void*>(pCtx->pOrigRet);
}
}
}
if (!pCtx)
{
pCtx = m_ContextStack.make_next();
pCtx->m_State = CHookContext::State_Born;
pCtx->m_CallOrig = true;
}
pCtx->pIface = NULL;
List<CVfnPtr*> &vfnptr_list = static_cast<CHookManager*>(hi)->GetVfnPtrList();
List<CVfnPtr*>::iterator vfnptr_iter;
for (vfnptr_iter = vfnptr_list.begin();
vfnptr_iter != vfnptr_list.end(); ++vfnptr_iter)
{
if (**vfnptr_iter == vfnptr)
break;
}
if (vfnptr_iter == vfnptr_list.end())
{
pCtx->m_State = CHookContext::State_Dead;
SH_DEBUG_LOG(VERBOSE, "CSourceHookImpl(%p)::SetupHookLoop\nThe hook is dead", this);
}
else
{
pCtx->pVfnPtr = *vfnptr_iter;
*origCallAddr = pCtx->pVfnPtr->GetOrigCallAddr();
pCtx->pIface = pCtx->pVfnPtr->FindIface(thisptr);
}
pCtx->pStatus = statusPtr;
pCtx->pPrevRes = prevResPtr;
pCtx->pCurRes = curResPtr;
pCtx->pThisPtr = thisptr;
pCtx->pOverrideRet = overrideRetPtr;
pCtx->pOrigRet = origRetPtr;
return pCtx;
}
void CSourceHookImpl::ResolvePendingUnloads(bool force)
{
List<PendingUnload *>::iterator iter = m_PendingUnloads.begin();
while (iter != m_PendingUnloads.end())
{
PendingUnload *unload = *iter;
if (!force && !unload->deactivated())
{
// Unless being forced, wait one drop of the context stack
// before actually unloading. Otherwise, we'll still return
// to unloaded memory.
unload->deactivate();
iter++;
}
else
{
unload->listener()->ReadyToUnload(unload->plugin());
delete unload;
iter = m_PendingUnloads.erase(iter);
}
}
}
void CSourceHookImpl::EndContext(IHookContext *pCtx)
{
// Do clean up task, if any is associated with this context
m_ContextStack.front().DoCleanupTaskAndDeleteIt();
// Then remove it
m_ContextStack.pop();
// If we've reached 0 contexts and there are pending unloads,
// resolve them now.
if (m_ContextStack.size() == 0 && m_PendingUnloads.size() != 0)
ResolvePendingUnloads();
}
void CSourceHookImpl::LogDebug(const char *format, ...)
{
va_list args;
va_start(args, format);
m_LogFunc(format, args);
va_end(args);
}
void CSourceHookImpl::CompleteShutdown()
{
CVector<int> removehooks;
m_HookIDMan.FindAllHooks(removehooks);
for (CVector<int>::iterator iter = removehooks.begin(); iter != removehooks.end(); ++iter)
RemoveHookByID(*iter);
}
void CSourceHookImpl::PausePlugin(Plugin plug)
{
CVector<int> pausehooks;
m_HookIDMan.FindAllHooks(pausehooks, plug);
for (CVector<int>::iterator iter = pausehooks.begin(); iter != pausehooks.end(); ++iter)
PauseHookByID(*iter);
}
void CSourceHookImpl::UnpausePlugin(Plugin plug)
{
CVector<int> unpausehooks;
m_HookIDMan.FindAllHooks(unpausehooks, plug);
for (CVector<int>::iterator iter = unpausehooks.begin(); iter != unpausehooks.end(); ++iter)
UnpauseHookByID(*iter);
}
bool CSourceHookImpl::PauseHookByID(int hookid)
{
return SetHookPaused(hookid, true);
}
bool CSourceHookImpl::UnpauseHookByID(int hookid)
{
return SetHookPaused(hookid, false);
}
bool CSourceHookImpl::SetHookPaused(int hookid, bool paused)
{
const CHookIDManager::Entry *hentry;
hentry = m_HookIDMan.QueryHook(hookid);
if (!hentry)
{
// hookid doesn't exist !
return false;
}
// find vfnptr
List<CVfnPtr>::iterator vfnptr_iter = m_VfnPtrs.find(hentry->vfnptr);
if (vfnptr_iter == m_VfnPtrs.end())
return false;
// find iface
List<CIface>::iterator iface_iter = vfnptr_iter->GetIfaceList().find(hentry->adjustediface);
if (iface_iter == vfnptr_iter->GetIfaceList().end())
return false;
// find hook
List<CHook> &hooks = hentry->post ? iface_iter->GetPostHookList() : iface_iter->GetPreHookList();
List<CHook>::iterator hook_iter = hooks.find(hookid);
if (hook_iter == hooks.end())
return false;
hook_iter->SetPaused(paused);
return true;
}
//////////////////////////////////////////////////////////////////////////
// CHookContext
//////////////////////////////////////////////////////////////////////////
ISHDelegate *CHookContext::GetNext()
{
SH_DEBUG_LOG(VERBOSE, "CHookContext(%p)::GetNext\n- m_State %d\n",(void*)this, m_State);
CIface *pVPIface;
switch (m_State)
{
case State_Dead:
return NULL;
case State_Born:
m_Iter = List<CHook>::iterator();
m_State = State_Pre;
// fall-through
case State_Recall_Pre:
m_State = State_Pre;
case State_Pre:
if (pIface)
{
if (!m_Iter)
m_Iter = pIface->GetPreHookList().begin();
else
++m_Iter;
SkipPaused(m_Iter, pIface->GetPreHookList());
if (m_Iter != pIface->GetPreHookList().end())
{
pIfacePtr = reinterpret_cast<void*>(reinterpret_cast<char*>(pThisPtr) - m_Iter->GetThisPointerOffset());
return m_Iter->GetHandler();
}
}
// end of normal hooks -> VP
m_State = State_PreVP;
m_Iter = List<CHook>::iterator();
// fall-through
case State_Recall_PreVP:
m_State = State_PreVP;
case State_PreVP:
pVPIface = pVfnPtr->FindIface(NULL);
if (pVPIface)
{
if (!m_Iter)
m_Iter = pVPIface->GetPreHookList().begin();
else
++m_Iter;
SkipPaused(m_Iter, pVPIface->GetPreHookList());
if (m_Iter != pVPIface->GetPreHookList())
{
pIfacePtr = reinterpret_cast<void*>(reinterpret_cast<char*>(pThisPtr) - m_Iter->GetThisPointerOffset());
return m_Iter->GetHandler();
}
}
// end VP hooks -> orig call
m_State = State_OrigCall;
SH_DEBUG_LOG(VERBOSE, "CHookContext(%p)::GetNext\n- No more PRE handler!\n",(void*)this);
return NULL;
case State_OrigCall:
m_Iter = List<CHook>::iterator();
m_State = State_Post;
// fall-through
case State_Post:
if (pIface)
{
if (!m_Iter)
m_Iter = pIface->GetPostHookList().begin();
else
++m_Iter;
SkipPaused(m_Iter, pIface->GetPostHookList());
if (m_Iter != pIface->GetPostHookList().end())
{
pIfacePtr = reinterpret_cast<void*>(reinterpret_cast<char*>(pThisPtr) - m_Iter->GetThisPointerOffset());
return m_Iter->GetHandler();
}
}
// end of normal hooks -> VP
m_State = State_PostVP;
m_Iter = List<CHook>::iterator();
// fall-through
case State_PostVP:
pVPIface = pVfnPtr->FindIface(NULL);
if (pVPIface)
{
if (!m_Iter)
m_Iter = pVPIface->GetPostHookList().begin();
else
++m_Iter;
SkipPaused(m_Iter, pVPIface->GetPostHookList());
if (m_Iter != pVPIface->GetPostHookList())
{
pIfacePtr = reinterpret_cast<void*>(reinterpret_cast<char*>(pThisPtr) - m_Iter->GetThisPointerOffset());
return m_Iter->GetHandler();
}
}
// end VP hooks -> done
m_State = State_Dead;
SH_DEBUG_LOG(VERBOSE, "CHookContext(%p)::GetNext\n- No more POST handler!\n",(void*)this);
return NULL;
case State_Recall_Post:
// Skip pre hooks _and_ orig call
m_State = State_Post;
return NULL;
case State_Recall_PostVP:
// Skip pre hooks _and_ orig call
m_State = State_PostVP;
return NULL;
}
SH_DEBUG_LOG(VERBOSE, "CHookContext(%p)::GetNext\n- Unknown state we fell through!\n",(void*)this);
return NULL;
}
void *CHookContext::GetOverrideRetPtr()
{
return pOverrideRet;
}
const void *CHookContext::GetOrigRetPtr()
{
return pOrigRet;
}
bool CHookContext::ShouldCallOrig()
{
return m_CallOrig;
}
void CHookContext::HookRemoved(List<CHook>::iterator oldhookiter, List<CHook>::iterator nexthookiter)
{
if (m_Iter == oldhookiter)
{
m_Iter = nexthookiter;
--m_Iter;
}
}
void CHookContext::IfaceRemoved(CIface *iface)
{
if (pIface == iface)
pIface = NULL;
}
void CHookContext::VfnPtrRemoved(CVfnPtr *vfnptr)
{
if (pVfnPtr == vfnptr)
{
// Don't set pVfnPtr = NULL here!
// It may be used still.
// RevertAndRemoveVfnPtr uses it to find the hook context
// to which to attach the cleanup task of the vfnptr.
//pVfnPtr = NULL;
m_State = State_Dead;
}
}
void CHookContext::DoCleanupTaskAndDeleteIt()
{
if (m_CleanupTask != NULL)
{
m_CleanupTask->CleanupAndDeleteThis();
}
}
}
}
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