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With this we can replace a SetVector with a plain std::vector. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238706 91177308-0d34-0410-b5e6-96231b3b80d8
182 lines
5.4 KiB
C++
182 lines
5.4 KiB
C++
//===- MCSection.h - Machine Code Sections ----------------------*- C++ -*-===//
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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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//
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// This file declares the MCSection class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTION_H
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#define LLVM_MC_MCSECTION_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/ilist.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class MCAssembler;
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class MCAsmInfo;
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class MCContext;
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class MCExpr;
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class MCFragment;
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class MCSection;
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class MCSymbol;
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class raw_ostream;
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/// Instances of this class represent a uniqued identifier for a section in the
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/// current translation unit. The MCContext class uniques and creates these.
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class MCSection {
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public:
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enum SectionVariant { SV_COFF = 0, SV_ELF, SV_MachO };
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/// \brief Express the state of bundle locked groups while emitting code.
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enum BundleLockStateType {
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NotBundleLocked,
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BundleLocked,
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BundleLockedAlignToEnd
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};
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typedef iplist<MCFragment> FragmentListType;
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typedef FragmentListType::const_iterator const_iterator;
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typedef FragmentListType::iterator iterator;
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typedef FragmentListType::const_reverse_iterator const_reverse_iterator;
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typedef FragmentListType::reverse_iterator reverse_iterator;
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private:
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MCSection(const MCSection &) = delete;
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void operator=(const MCSection &) = delete;
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MCSymbol *Begin;
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MCSymbol *End = nullptr;
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/// The alignment requirement of this section.
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unsigned Alignment = 1;
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/// The section index in the assemblers section list.
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unsigned Ordinal = 0;
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/// The index of this section in the layout order.
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unsigned LayoutOrder;
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/// \brief Keeping track of bundle-locked state.
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BundleLockStateType BundleLockState = NotBundleLocked;
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/// \brief Current nesting depth of bundle_lock directives.
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unsigned BundleLockNestingDepth = 0;
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/// \brief We've seen a bundle_lock directive but not its first instruction
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/// yet.
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unsigned BundleGroupBeforeFirstInst : 1;
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/// Whether this section has had instructions emitted into it.
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unsigned HasInstructions : 1;
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unsigned IsRegistered : 1;
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FragmentListType Fragments;
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/// Mapping from subsection number to insertion point for subsection numbers
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/// below that number.
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SmallVector<std::pair<unsigned, MCFragment *>, 1> SubsectionFragmentMap;
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protected:
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MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin);
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SectionVariant Variant;
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SectionKind Kind;
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public:
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virtual ~MCSection();
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SectionKind getKind() const { return Kind; }
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SectionVariant getVariant() const { return Variant; }
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MCSymbol *getBeginSymbol() { return Begin; }
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const MCSymbol *getBeginSymbol() const {
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return const_cast<MCSection *>(this)->getBeginSymbol();
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}
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void setBeginSymbol(MCSymbol *Sym) {
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assert(!Begin);
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Begin = Sym;
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}
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MCSymbol *getEndSymbol(MCContext &Ctx);
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bool hasEnded() const;
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unsigned getAlignment() const { return Alignment; }
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void setAlignment(unsigned Value) { Alignment = Value; }
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unsigned getOrdinal() const { return Ordinal; }
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void setOrdinal(unsigned Value) { Ordinal = Value; }
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unsigned getLayoutOrder() const { return LayoutOrder; }
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void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
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BundleLockStateType getBundleLockState() const { return BundleLockState; }
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void setBundleLockState(BundleLockStateType NewState);
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bool isBundleLocked() const { return BundleLockState != NotBundleLocked; }
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bool isBundleGroupBeforeFirstInst() const {
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return BundleGroupBeforeFirstInst;
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}
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void setBundleGroupBeforeFirstInst(bool IsFirst) {
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BundleGroupBeforeFirstInst = IsFirst;
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}
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bool hasInstructions() const { return HasInstructions; }
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void setHasInstructions(bool Value) { HasInstructions = Value; }
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bool isRegistered() const { return IsRegistered; }
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void setIsRegistered(bool Value) { IsRegistered = Value; }
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MCSection::FragmentListType &getFragmentList() { return Fragments; }
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const MCSection::FragmentListType &getFragmentList() const {
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return const_cast<MCSection *>(this)->getFragmentList();
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}
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MCSection::iterator begin();
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MCSection::const_iterator begin() const {
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return const_cast<MCSection *>(this)->begin();
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}
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MCSection::iterator end();
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MCSection::const_iterator end() const {
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return const_cast<MCSection *>(this)->end();
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}
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MCSection::reverse_iterator rbegin();
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MCSection::const_reverse_iterator rbegin() const {
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return const_cast<MCSection *>(this)->rbegin();
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}
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MCSection::reverse_iterator rend();
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MCSection::const_reverse_iterator rend() const {
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return const_cast<MCSection *>(this)->rend();
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}
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MCSection::iterator getSubsectionInsertionPoint(unsigned Subsection);
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void dump();
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virtual void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
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const MCExpr *Subsection) const = 0;
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/// Return true if a .align directive should use "optimized nops" to fill
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/// instead of 0s.
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virtual bool UseCodeAlign() const = 0;
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/// Check whether this section is "virtual", that is has no actual object
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/// file contents.
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virtual bool isVirtualSection() const = 0;
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};
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} // end namespace llvm
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#endif
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