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c2b29240e0
SHF_ARM_PURECODE flag when being built with the -mexecute-only flag. All code sections of an ELF must have the flag set for the final .text section to be execute-only, otherwise the flag gets removed. A HasData flag is added to MCSection to aid in the determination that the section is empty. A virtual setTargetSectionFlags is added to MCELFObjectTargetWriter to allow subclasses to set target specific section flags to be added to sections which we then use in the ARM backend to set SHF_ARM_PURECODE. Patch by Ivan Lozano! Reviewed By: echristo Differential Revision: https://reviews.llvm.org/D48792 llvm-svn: 341593
195 lines
5.9 KiB
C++
195 lines
5.9 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/ilist.h"
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#include "llvm/MC/MCFragment.h"
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#include "llvm/MC/SectionKind.h"
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#include <cassert>
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#include <utility>
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namespace llvm {
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class MCAsmInfo;
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class MCContext;
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class MCExpr;
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class MCSymbol;
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class raw_ostream;
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class Triple;
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template <> struct ilist_alloc_traits<MCFragment> {
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static void deleteNode(MCFragment *V);
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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, SV_Wasm };
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/// 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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using FragmentListType = iplist<MCFragment>;
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using const_iterator = FragmentListType::const_iterator;
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using iterator = FragmentListType::iterator;
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using const_reverse_iterator = FragmentListType::const_reverse_iterator;
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using reverse_iterator = FragmentListType::reverse_iterator;
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private:
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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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/// Keeping track of bundle-locked state.
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BundleLockStateType BundleLockState = NotBundleLocked;
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/// Current nesting depth of bundle_lock directives.
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unsigned BundleLockNestingDepth = 0;
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/// We've seen a bundle_lock directive but not its first instruction
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/// yet.
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bool BundleGroupBeforeFirstInst : 1;
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/// Whether this section has had instructions emitted into it.
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bool HasInstructions : 1;
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/// Whether this section has had data emitted into it.
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/// Right now this is only used by the ARM backend.
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bool HasData : 1;
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bool IsRegistered : 1;
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MCDummyFragment DummyFragment;
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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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SectionVariant Variant;
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SectionKind Kind;
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MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin);
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~MCSection();
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public:
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MCSection(const MCSection &) = delete;
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MCSection &operator=(const MCSection &) = delete;
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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 hasData() const { return HasData; }
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void setHasData(bool Value) { HasData = 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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/// Support for MCFragment::getNextNode().
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static FragmentListType MCSection::*getSublistAccess(MCFragment *) {
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return &MCSection::Fragments;
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}
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const MCDummyFragment &getDummyFragment() const { return DummyFragment; }
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MCDummyFragment &getDummyFragment() { return DummyFragment; }
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iterator begin() { return Fragments.begin(); }
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const_iterator begin() const { return Fragments.begin(); }
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iterator end() { return Fragments.end(); }
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const_iterator end() const { return Fragments.end(); }
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reverse_iterator rbegin() { return Fragments.rbegin(); }
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const_reverse_iterator rbegin() const { return Fragments.rbegin(); }
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reverse_iterator rend() { return Fragments.rend(); }
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const_reverse_iterator rend() const { return Fragments.rend(); }
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MCSection::iterator getSubsectionInsertionPoint(unsigned Subsection);
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void dump() const;
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virtual void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
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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 // LLVM_MC_MCSECTION_H
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