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86 lines
2.5 KiB
86 lines
2.5 KiB
7 months ago
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//===- Stub.cpp -----------------------------------------------------------===//
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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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#include "mcld/Fragment/Stub.h"
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#include "mcld/IRBuilder.h"
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#include "mcld/Fragment/Relocation.h"
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#include "mcld/LD/BranchIsland.h"
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#include "mcld/LD/ResolveInfo.h"
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#include <cassert>
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namespace mcld {
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Stub::Stub() : Fragment(Fragment::Stub), m_pSymInfo(NULL) {
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}
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Stub::~Stub() {
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for (fixup_iterator fixup = fixup_begin(); fixup != fixup_end(); ++fixup)
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delete (*fixup);
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}
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void Stub::setSymInfo(ResolveInfo* pSymInfo) {
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m_pSymInfo = pSymInfo;
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}
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void Stub::applyFixup(Relocation& pSrcReloc,
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IRBuilder& pBuilder,
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BranchIsland& pIsland) {
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// build a name for stub symbol
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std::string sym_name("__");
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sym_name.append(pSrcReloc.symInfo()->name())
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.append("_")
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.append(name())
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.append("@")
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.append(pIsland.name());
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// create LDSymbol for the stub
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LDSymbol* symbol =
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pBuilder.AddSymbol<IRBuilder::Force, IRBuilder::Unresolve>(
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sym_name,
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ResolveInfo::Function,
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ResolveInfo::Define,
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ResolveInfo::Local,
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size(),
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initSymValue(),
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FragmentRef::Create(*this, initSymValue()),
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ResolveInfo::Default);
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setSymInfo(symbol->resolveInfo());
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// add relocations of this stub (i.e., set the branch target of the stub)
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for (fixup_iterator it = fixup_begin(), ie = fixup_end(); it != ie; ++it) {
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Relocation* reloc =
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Relocation::Create((*it)->type(),
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*(FragmentRef::Create(*this, (*it)->offset())),
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(*it)->addend());
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reloc->setSymInfo(pSrcReloc.symInfo());
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pIsland.addRelocation(*reloc);
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}
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}
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void Stub::applyFixup(FragmentRef& pSrcFragRef,
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IRBuilder& pBuilder,
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BranchIsland& pIsland) {
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// If applying fixups is based on the source FragmentRef, each target stub
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// probably should override this function.
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assert(0 && "target stub should override this function");
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}
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void Stub::addFixup(DWord pOffset, SWord pAddend, Type pType) {
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assert(pOffset < size());
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m_FixupList.push_back(new Fixup(pOffset, pAddend, pType));
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}
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void Stub::addFixup(const Fixup& pFixup) {
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assert(pFixup.offset() < size());
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m_FixupList.push_back(new Fixup(pFixup));
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}
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} // namespace mcld
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