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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.
//
// Hash table associated with each module that records for all types defined in that module the mapping
// between type name and token (or TypeHandle).
//
#ifndef CLASSHASH_INL
#define CLASSHASH_INL
// Low bit is discriminator between unresolved and resolved.
// Low bit == 0: Resolved: data == TypeHandle
// Low bit == 1: Unresolved: data encodes either a typeDef or exportTypeDef. Use bit 31 as discriminator.
//
// If not resolved, bit 31 (64-bit: yes, it's bit31, not the high bit!) is discriminator between regular typeDef and exportedType
//
// Bit31 == 0: mdTypeDef: 000t tttt tttt tttt tttt tttt tttt ttt1
// Bit31 == 1: mdExportedType: 100e eeee eeee eeee eeee eeee eeee eee1
//
//
/* static */
inline PTR_VOID EEClassHashTable::CompressClassDef(mdToken cl)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(TypeFromToken(cl) == mdtTypeDef || TypeFromToken(cl) == mdtExportedType);
switch (TypeFromToken(cl))
{
case mdtTypeDef: return (PTR_VOID)( 0 | (((ULONG_PTR)cl & 0x00ffffff) << 1) | EECLASSHASH_TYPEHANDLE_DISCR);
case mdtExportedType: return (PTR_VOID)(EECLASSHASH_MDEXPORT_DISCR | (((ULONG_PTR)cl & 0x00ffffff) << 1) | EECLASSHASH_TYPEHANDLE_DISCR);
default:
_ASSERTE(!"Can't get here.");
return 0;
}
}
inline DWORD EEClassHashTable::Hash(LPCUTF8 pszNamespace, LPCUTF8 pszClassName)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
FORBID_FAULT;
SUPPORTS_DAC;
}
CONTRACTL_END;
DWORD dwHash = 5381;
DWORD dwChar;
while ((dwChar = *pszNamespace++) != 0)
dwHash = ((dwHash << 5) + dwHash) ^ dwChar;
while ((dwChar = *pszClassName++) != 0)
dwHash = ((dwHash << 5) + dwHash) ^ dwChar;
return dwHash;
}
#endif // CLASSHASH_INL
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