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81 lines
2.2 KiB
81 lines
2.2 KiB
7 months ago
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//===- IdenticalCodeFolding.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_IDENTICALCODEFOLDING_H_
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#define MCLD_LD_IDENTICALCODEFOLDING_H_
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#include <llvm/ADT/MapVector.h>
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#include <string>
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#include <vector>
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namespace mcld {
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class Input;
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class LDSection;
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class LinkerConfig;
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class Module;
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class Relocation;
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class TargetLDBackend;
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/** \class IdenticalCodeFolding
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* \brief Implementation of identical code folding for --icf=[none|all|safe]
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* @ref Safe ICF: Pointer Safe and Unwinding Aware Identical Code Folding in
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* Gold, http://research.google.com/pubs/pub36912.html
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*/
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class IdenticalCodeFolding {
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public:
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typedef std::pair<Input*, size_t> ObjectAndId;
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typedef llvm::MapVector<LDSection*, ObjectAndId> KeptSections;
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private:
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class FoldingCandidate {
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public:
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FoldingCandidate() : sect(NULL), reloc_sect(NULL), obj(NULL) {}
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FoldingCandidate(LDSection* pCode, LDSection* pReloc, Input* pInput)
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: sect(pCode), reloc_sect(pReloc), obj(pInput) {}
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void initConstantContent(
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const TargetLDBackend& pBackend,
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const IdenticalCodeFolding::KeptSections& pKeptSections);
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std::string getContentWithVariables(
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const TargetLDBackend& pBackend,
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const IdenticalCodeFolding::KeptSections& pKeptSections);
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LDSection* sect;
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LDSection* reloc_sect;
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Input* obj;
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std::string content;
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std::vector<Relocation*> variable_relocs;
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};
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typedef std::vector<FoldingCandidate> FoldingCandidates;
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public:
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IdenticalCodeFolding(const LinkerConfig& pConfig,
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const TargetLDBackend& pBackend,
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Module& pModule);
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void foldIdenticalCode();
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private:
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void findCandidates(FoldingCandidates& pCandidateList);
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bool matchCandidates(FoldingCandidates& pCandidateList);
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private:
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const LinkerConfig& m_Config;
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const TargetLDBackend& m_Backend;
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Module& m_Module;
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KeptSections m_KeptSections;
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};
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} // namespace mcld
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#endif // MCLD_LD_IDENTICALCODEFOLDING_H_
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