1 //===- lib/MC/MCSection.cpp - Machine Code Section Representation ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCSection.h"
11 #include "llvm/ADT/SmallVector.h"
12 #include "llvm/Config/llvm-config.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCFragment.h"
15 #include "llvm/MC/MCSymbol.h"
16 #include "llvm/Support/Compiler.h"
17 #include "llvm/Support/ErrorHandling.h"
18 #include "llvm/Support/raw_ostream.h"
24 MCSection::MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin)
25 : Begin(Begin), BundleGroupBeforeFirstInst(false), HasInstructions(false),
26 HasData(false), IsRegistered(false), DummyFragment(this), Variant(V),
29 MCSymbol *MCSection::getEndSymbol(MCContext &Ctx) {
31 End = Ctx.createTempSymbol("sec_end", true);
35 bool MCSection::hasEnded() const { return End && End->isInSection(); }
37 MCSection::~MCSection() = default;
39 void MCSection::setBundleLockState(BundleLockStateType NewState) {
40 if (NewState == NotBundleLocked) {
41 if (BundleLockNestingDepth == 0) {
42 report_fatal_error("Mismatched bundle_lock/unlock directives");
44 if (--BundleLockNestingDepth == 0) {
45 BundleLockState = NotBundleLocked;
50 // If any of the directives is an align_to_end directive, the whole nested
51 // group is align_to_end. So don't downgrade from align_to_end to just locked.
52 if (BundleLockState != BundleLockedAlignToEnd) {
53 BundleLockState = NewState;
55 ++BundleLockNestingDepth;
59 MCSection::getSubsectionInsertionPoint(unsigned Subsection) {
60 if (Subsection == 0 && SubsectionFragmentMap.empty())
63 SmallVectorImpl<std::pair<unsigned, MCFragment *>>::iterator MI =
64 std::lower_bound(SubsectionFragmentMap.begin(),
65 SubsectionFragmentMap.end(),
66 std::make_pair(Subsection, (MCFragment *)nullptr));
67 bool ExactMatch = false;
68 if (MI != SubsectionFragmentMap.end()) {
69 ExactMatch = MI->first == Subsection;
74 if (MI == SubsectionFragmentMap.end())
77 IP = MI->second->getIterator();
78 if (!ExactMatch && Subsection != 0) {
79 // The GNU as documentation claims that subsections have an alignment of 4,
80 // although this appears not to be the case.
81 MCFragment *F = new MCDataFragment();
82 SubsectionFragmentMap.insert(MI, std::make_pair(Subsection, F));
83 getFragmentList().insert(IP, F);
90 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
91 LLVM_DUMP_METHOD void MCSection::dump() const {
92 raw_ostream &OS = errs();
95 OS << " Fragments:[\n ";
96 for (auto it = begin(), ie = end(); it != ie; ++it) {