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#include "pch.h"
HMODULE hTier0Module;
IMemAlloc** g_ppMemAllocSingleton;
void LoadTier0Handle()
{
hTier0Module = GetModuleHandleA("tier0.dll");
if (!hTier0Module) return;
g_ppMemAllocSingleton = (IMemAlloc**)GetProcAddress(hTier0Module, "g_pMemAllocSingleton");
}
const int STATIC_ALLOC_SIZE = 4096;
size_t g_iStaticAllocated = 0;
char pStaticAllocBuf[STATIC_ALLOC_SIZE];
// they should never be used here, except in LibraryLoadError
void* operator new(size_t n)
{
// allocate into static buffer
if (g_iStaticAllocated + n <= STATIC_ALLOC_SIZE)
{
void* ret = pStaticAllocBuf + g_iStaticAllocated;
g_iStaticAllocated += n;
return ret;
}
else
{
// try to fallback to g_pMemAllocSingleton
if (!hTier0Module) LoadTier0Handle();
if (g_ppMemAllocSingleton && *g_ppMemAllocSingleton)
return (*g_ppMemAllocSingleton)->m_vtable->Alloc(*g_ppMemAllocSingleton, n);
else
throw "Cannot allocate";
}
}
void operator delete(void* p)
{
// if it was allocated into the static buffer, just do nothing, safest way to deal with it
if (p >= pStaticAllocBuf && p <= pStaticAllocBuf + STATIC_ALLOC_SIZE)
return;
if (g_ppMemAllocSingleton && *g_ppMemAllocSingleton)
(*g_ppMemAllocSingleton)->m_vtable->Free(*g_ppMemAllocSingleton, p);
}
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