#ifndef LLVM_MC_MCSECTION_H
#define LLVM_MC_MCSECTION_H
+#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/ilist.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/MC/MCFragment.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
- class MCAsmInfo;
- class raw_ostream;
-
- /// MCSection - Instances of this class represent a uniqued identifier for a
- /// section in the current translation unit. The MCContext class uniques and
- /// creates these.
- class MCSection {
- public:
- enum SectionVariant {
- SV_COFF = 0,
- SV_ELF,
- SV_MachO
- };
-
- private:
- MCSection(const MCSection&) LLVM_DELETED_FUNCTION;
- void operator=(const MCSection&) LLVM_DELETED_FUNCTION;
- protected:
- MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
- SectionVariant Variant;
- SectionKind Kind;
- public:
- virtual ~MCSection();
-
- SectionKind getKind() const { return Kind; }
-
- SectionVariant getVariant() const { return Variant; }
-
- virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
- raw_ostream &OS) const = 0;
-
- // Convenience routines to get label names for the beginning/end of a
- // section.
- virtual std::string getLabelBeginName() const = 0;
- virtual std::string getLabelEndName() const = 0;
-
- /// isBaseAddressKnownZero - Return true if we know that this section will
- /// get a base address of zero. In cases where we know that this is true we
- /// can emit section offsets as direct references to avoid a subtraction
- /// from the base of the section, saving a relocation.
- virtual bool isBaseAddressKnownZero() const {
- return false;
- }
-
- // UseCodeAlign - Return true if a .align directive should use
- // "optimized nops" to fill instead of 0s.
- virtual bool UseCodeAlign() const = 0;
-
- /// isVirtualSection - Check whether this section is "virtual", that is
- /// has no actual object file contents.
- virtual bool isVirtualSection() const = 0;
+class MCAsmInfo;
+class MCAssembler;
+class MCContext;
+class MCExpr;
+class MCFragment;
+class MCSection;
+class MCSymbol;
+class raw_ostream;
+
+template<>
+struct ilist_node_traits<MCFragment> {
+ MCFragment *createNode(const MCFragment &V);
+ static void deleteNode(MCFragment *V);
+
+ void addNodeToList(MCFragment *) {}
+ void removeNodeFromList(MCFragment *) {}
+ void transferNodesFromList(ilist_node_traits & /*SrcTraits*/,
+ ilist_iterator<MCFragment> /*first*/,
+ ilist_iterator<MCFragment> /*last*/) {}
+};
+
+/// Instances of this class represent a uniqued identifier for a section in the
+/// current translation unit. The MCContext class uniques and creates these.
+class MCSection {
+public:
+ enum SectionVariant { SV_COFF = 0, SV_ELF, SV_MachO };
+
+ /// \brief Express the state of bundle locked groups while emitting code.
+ enum BundleLockStateType {
+ NotBundleLocked,
+ BundleLocked,
+ BundleLockedAlignToEnd
};
+ typedef iplist<MCFragment> FragmentListType;
+
+ typedef FragmentListType::const_iterator const_iterator;
+ typedef FragmentListType::iterator iterator;
+
+ typedef FragmentListType::const_reverse_iterator const_reverse_iterator;
+ typedef FragmentListType::reverse_iterator reverse_iterator;
+
+private:
+ MCSection(const MCSection &) = delete;
+ void operator=(const MCSection &) = delete;
+
+ MCSymbol *Begin;
+ MCSymbol *End = nullptr;
+ /// The alignment requirement of this section.
+ unsigned Alignment = 1;
+ /// The section index in the assemblers section list.
+ unsigned Ordinal = 0;
+ /// The index of this section in the layout order.
+ unsigned LayoutOrder;
+
+ /// \brief Keeping track of bundle-locked state.
+ BundleLockStateType BundleLockState = NotBundleLocked;
+
+ /// \brief Current nesting depth of bundle_lock directives.
+ unsigned BundleLockNestingDepth = 0;
+
+ /// \brief We've seen a bundle_lock directive but not its first instruction
+ /// yet.
+ unsigned BundleGroupBeforeFirstInst : 1;
+
+ /// Whether this section has had instructions emitted into it.
+ unsigned HasInstructions : 1;
+
+ unsigned IsRegistered : 1;
+
+ MCDummyFragment DummyFragment;
+
+ FragmentListType Fragments;
+
+ /// Mapping from subsection number to insertion point for subsection numbers
+ /// below that number.
+ SmallVector<std::pair<unsigned, MCFragment *>, 1> SubsectionFragmentMap;
+
+protected:
+ MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin);
+ SectionVariant Variant;
+ SectionKind Kind;
+ ~MCSection();
+
+public:
+ SectionKind getKind() const { return Kind; }
+
+ SectionVariant getVariant() const { return Variant; }
+
+ MCSymbol *getBeginSymbol() { return Begin; }
+ const MCSymbol *getBeginSymbol() const {
+ return const_cast<MCSection *>(this)->getBeginSymbol();
+ }
+ void setBeginSymbol(MCSymbol *Sym) {
+ assert(!Begin);
+ Begin = Sym;
+ }
+ MCSymbol *getEndSymbol(MCContext &Ctx);
+ bool hasEnded() const;
+
+ unsigned getAlignment() const { return Alignment; }
+ void setAlignment(unsigned Value) { Alignment = Value; }
+
+ unsigned getOrdinal() const { return Ordinal; }
+ void setOrdinal(unsigned Value) { Ordinal = Value; }
+
+ unsigned getLayoutOrder() const { return LayoutOrder; }
+ void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
+
+ BundleLockStateType getBundleLockState() const { return BundleLockState; }
+ void setBundleLockState(BundleLockStateType NewState);
+ bool isBundleLocked() const { return BundleLockState != NotBundleLocked; }
+
+ bool isBundleGroupBeforeFirstInst() const {
+ return BundleGroupBeforeFirstInst;
+ }
+ void setBundleGroupBeforeFirstInst(bool IsFirst) {
+ BundleGroupBeforeFirstInst = IsFirst;
+ }
+
+ bool hasInstructions() const { return HasInstructions; }
+ void setHasInstructions(bool Value) { HasInstructions = Value; }
+
+ bool isRegistered() const { return IsRegistered; }
+ void setIsRegistered(bool Value) { IsRegistered = Value; }
+
+ MCSection::FragmentListType &getFragmentList() { return Fragments; }
+ const MCSection::FragmentListType &getFragmentList() const {
+ return const_cast<MCSection *>(this)->getFragmentList();
+ }
+
+ /// Support for MCFragment::getNextNode().
+ static FragmentListType MCSection::*getSublistAccess(MCFragment *) {
+ return &MCSection::Fragments;
+ }
+
+ const MCDummyFragment &getDummyFragment() const { return DummyFragment; }
+ MCDummyFragment &getDummyFragment() { return DummyFragment; }
+
+ MCSection::iterator begin();
+ MCSection::const_iterator begin() const {
+ return const_cast<MCSection *>(this)->begin();
+ }
+
+ MCSection::iterator end();
+ MCSection::const_iterator end() const {
+ return const_cast<MCSection *>(this)->end();
+ }
+
+ MCSection::reverse_iterator rbegin();
+ MCSection::const_reverse_iterator rbegin() const {
+ return const_cast<MCSection *>(this)->rbegin();
+ }
+
+ MCSection::reverse_iterator rend();
+ MCSection::const_reverse_iterator rend() const {
+ return const_cast<MCSection *>(this)->rend();
+ }
+
+ MCSection::iterator getSubsectionInsertionPoint(unsigned Subsection);
+
+ void dump();
+
+ virtual void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
+ const MCExpr *Subsection) const = 0;
+
+ /// Return true if a .align directive should use "optimized nops" to fill
+ /// instead of 0s.
+ virtual bool UseCodeAlign() const = 0;
+
+ /// Check whether this section is "virtual", that is has no actual object
+ /// file contents.
+ virtual bool isVirtualSection() const = 0;
+};
+
} // end namespace llvm
#endif
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