74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
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//===- Resolver.h ---------------------------------------------------------===//
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//
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// The MCLinker Project
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MCLD_LD_RESOLVER_H_
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#define MCLD_LD_RESOLVER_H_
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#include "mcld/LD/LDSymbol.h"
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#include <string>
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#include <utility>
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namespace mcld {
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class NamePool;
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class ResolveInfo;
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/** \class Resolver
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* \brief Resolver binds a symbol reference from one file to a symbol
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* definition of another file.
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*
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* Resolver seals up the algorithm of symbol resolution. The resolution of
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* two symbols depends on their type, binding and whether it is belonging to
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* a shared object.
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*/
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class Resolver {
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public:
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enum Action { Success, Warning, Abort, LastAction };
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/** \class Resolver::Result
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* \brief the result of symbol resolution
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* - info, the pointer to overrided info
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* - existent, if true, the info is existent
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* - overriden, if true, the info is being overriden.
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*/
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struct Result {
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ResolveInfo* info;
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bool existent;
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bool overriden;
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};
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public:
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virtual ~Resolver();
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/// shouldOverride - Can resolver override the symbol pOld by the symbol pNew?
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/// @return the action should be taken.
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/// @param pOld the symbol which may be overridden.
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/// @param pNew the symbol which is used to replace pOld
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virtual bool resolve(ResolveInfo& __restrict__ pOld,
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const ResolveInfo& __restrict__ pNew,
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bool& pOverride,
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LDSymbol::ValueType pValue) const = 0;
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/// resolveAgain - Can override by derived classes.
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/// @return the pointer to resolved ResolveInfo
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/// @return is the symbol existent?
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virtual void resolveAgain(NamePool& pNamePool,
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unsigned int pAction,
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ResolveInfo& __restrict__ pOld,
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const ResolveInfo& __restrict__ pNew,
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Result& pResult) const {
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pResult.info = NULL;
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pResult.existent = false;
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pResult.overriden = false;
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}
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};
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} // namespace mcld
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#endif // MCLD_LD_RESOLVER_H_
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