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https://github.com/c64scene-ar/llvm-6502.git
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MCFragment didn't really need vtables. The majority of virtual methods were just getters and setters. This removes the vtables and uses dispatch on the kind to do things like delete which needs to get the appropriate class. This reduces memory on the verify use list order test case by about 2MB out of 800MB. Reviewed by Rafael Espíndola git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239952 91177308-0d34-0410-b5e6-96231b3b80d8
194 lines
5.8 KiB
C++
194 lines
5.8 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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template<>
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struct ilist_node_traits<MCFragment> {
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MCFragment *createNode(const MCFragment &V);
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static void deleteNode(MCFragment *V);
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void addNodeToList(MCFragment *) {}
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void removeNodeFromList(MCFragment *) {}
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void transferNodesFromList(ilist_node_traits & /*SrcTraits*/,
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ilist_iterator<MCFragment> /*first*/,
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ilist_iterator<MCFragment> /*last*/) {}
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};
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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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