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110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
//===- lib/MC/MCSection.cpp - Machine Code Section Representation ---------===//
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//
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// The LLVM Compiler Infrastructure
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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 "llvm/MC/MCSection.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// MCSection
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//===----------------------------------------------------------------------===//
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MCSection::MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin)
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: Begin(Begin), BundleGroupBeforeFirstInst(false), HasInstructions(false),
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IsRegistered(false), DummyFragment(this), Variant(V), Kind(K) {}
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MCSymbol *MCSection::getEndSymbol(MCContext &Ctx) {
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if (!End)
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End = Ctx.createTempSymbol("sec_end", true);
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return End;
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}
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bool MCSection::hasEnded() const { return End && End->isInSection(); }
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MCSection::~MCSection() {
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}
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void MCSection::setBundleLockState(BundleLockStateType NewState) {
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if (NewState == NotBundleLocked) {
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if (BundleLockNestingDepth == 0) {
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report_fatal_error("Mismatched bundle_lock/unlock directives");
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}
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if (--BundleLockNestingDepth == 0) {
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BundleLockState = NotBundleLocked;
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}
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return;
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}
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// If any of the directives is an align_to_end directive, the whole nested
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// group is align_to_end. So don't downgrade from align_to_end to just locked.
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if (BundleLockState != BundleLockedAlignToEnd) {
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BundleLockState = NewState;
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}
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++BundleLockNestingDepth;
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}
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MCSection::iterator
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MCSection::getSubsectionInsertionPoint(unsigned Subsection) {
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if (Subsection == 0 && SubsectionFragmentMap.empty())
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return end();
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SmallVectorImpl<std::pair<unsigned, MCFragment *>>::iterator MI =
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std::lower_bound(SubsectionFragmentMap.begin(),
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SubsectionFragmentMap.end(),
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std::make_pair(Subsection, (MCFragment *)nullptr));
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bool ExactMatch = false;
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if (MI != SubsectionFragmentMap.end()) {
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ExactMatch = MI->first == Subsection;
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if (ExactMatch)
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++MI;
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}
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iterator IP;
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if (MI == SubsectionFragmentMap.end())
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IP = end();
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else
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IP = MI->second->getIterator();
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if (!ExactMatch && Subsection != 0) {
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// The GNU as documentation claims that subsections have an alignment of 4,
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// although this appears not to be the case.
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MCFragment *F = new MCDataFragment();
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SubsectionFragmentMap.insert(MI, std::make_pair(Subsection, F));
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getFragmentList().insert(IP, F);
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F->setParent(this);
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}
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return IP;
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void MCSection::dump() {
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raw_ostream &OS = llvm::errs();
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OS << "<MCSection";
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OS << " Fragments:[\n ";
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for (auto it = begin(), ie = end(); it != ie; ++it) {
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if (it != begin())
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OS << ",\n ";
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it->dump();
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}
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OS << "]>";
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}
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#endif
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MCSection::iterator MCSection::begin() { return Fragments.begin(); }
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MCSection::iterator MCSection::end() { return Fragments.end(); }
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MCSection::reverse_iterator MCSection::rbegin() { return Fragments.rbegin(); }
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MCSection::reverse_iterator MCSection::rend() { return Fragments.rend(); }
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