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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// ZapWrapper.h
//
//
// ZapNode that wraps EE datastructure for zapping
//
// ======================================================================================
#ifndef __ZAPWRAPPER_H__
#define __ZAPWRAPPER_H__
//
// When generating compiled code for IL, the compiler will need to embed
// handles, which are pointers to various data structures. The data
// structures may either not exist, or we may not have some information
// we need for optimal code gen.
//
// In such cases, we use placeholders. Compiled code embed pointers
// to placeholders, which then have rich information about the
// referenced data structure.
//
// Once information is finally available for the exact code required,
// ZapWrapper::Resolve makes the place holder to point to the intended target.
//
class ZapWrapper : public ZapNode
{
PVOID m_handle;
public:
ZapWrapper(PVOID handle)
: m_handle(handle)
{
}
ZapWrapper()
{
}
void SetHandle(PVOID handle)
{
_ASSERTE(m_handle == NULL);
_ASSERTE(handle != NULL);
m_handle = handle;
}
PVOID GetHandle()
{
return m_handle;
}
virtual ZapNode * GetBase()
{
return this;
}
virtual void Resolve(ZapImage * pImage)
{
}
};
class ZapWrapperTable
{
class WrapperTraits : public NoRemoveSHashTraits< DefaultSHashTraits<ZapWrapper *> >
{
public:
typedef PVOID key_t;
static key_t GetKey(element_t e)
{
LIMITED_METHOD_CONTRACT;
return e->GetHandle();
}
static BOOL Equals(key_t k1, key_t k2)
{
LIMITED_METHOD_CONTRACT;
return k1 == k2;
}
static count_t Hash(key_t k)
{
LIMITED_METHOD_CONTRACT;
return (count_t)(size_t)k;
}
static const element_t Null() { LIMITED_METHOD_CONTRACT; return NULL; }
static bool IsNull(const element_t &e) { LIMITED_METHOD_CONTRACT; return e == NULL; }
};
typedef SHash< WrapperTraits > WrapperTable;
WrapperTable m_entries;
ZapImage * m_pImage;
//
// Helper for inserting actual implementations of placeholders into hashtable
//
template < typename impl, ZapNodeType type >
ZapNode * GetPlaceHolder(PVOID handle)
{
ZapWrapper * pPlaceHolder = m_entries.Lookup(handle);
if (pPlaceHolder != NULL)
{
_ASSERTE(pPlaceHolder->GetType() == type);
return pPlaceHolder;
}
pPlaceHolder = new (m_pImage->GetHeap()) impl();
_ASSERTE(pPlaceHolder->GetType() == type);
pPlaceHolder->SetHandle(handle);
m_entries.Add(pPlaceHolder);
return pPlaceHolder;
}
public:
ZapWrapperTable(ZapImage * pImage)
: m_pImage(pImage)
{
}
void Preallocate(COUNT_T cbILImage)
{
PREALLOCATE_HASHTABLE(ZapWrapperTable::m_entries, 0.0013, cbILImage);
}
ZapNode * GetMethodHandle(CORINFO_METHOD_HANDLE handle);
ZapNode * GetClassHandle(CORINFO_CLASS_HANDLE handle);
ZapNode * GetFieldHandle(CORINFO_FIELD_HANDLE handle);
ZapNode * GetAddrOfPInvokeFixup(CORINFO_METHOD_HANDLE handle);
ZapNode * GetGenericHandle(CORINFO_GENERIC_HANDLE handle);
ZapNode * GetModuleIDHandle(CORINFO_MODULE_HANDLE handle);
ZapNode * GetStub(void * pStub);
void Resolve();
};
#endif // __ZAPWRAPPER_H__
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