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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
//===- lib/MC/MCSection.cpp - Machine Code Section Representation ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSection.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCFragment.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <utility>
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using namespace llvm;
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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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HasData(false), IsRegistered(false), DummyFragment(this), Variant(V),
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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() = default;
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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() const {
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raw_ostream &OS = 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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