#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCFragment.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCLinkerOptimizationHint.h"
#include "llvm/MC/MCSubtargetInfo.h"
class MCValue;
class MCAsmBackend;
-class MCFragment : public ilist_node_with_parent<MCFragment, MCSection> {
- friend class MCAsmLayout;
-
- MCFragment(const MCFragment &) = delete;
- void operator=(const MCFragment &) = delete;
-
-public:
- enum FragmentType : uint8_t {
- FT_Align,
- FT_Data,
- FT_CompactEncodedInst,
- FT_Fill,
- FT_Relaxable,
- FT_Org,
- FT_Dwarf,
- FT_DwarfFrame,
- FT_LEB,
- FT_SafeSEH,
- FT_Dummy
- };
-
-private:
- FragmentType Kind;
-
-protected:
- bool HasInstructions;
-
-private:
- /// \brief Should this fragment be aligned to the end of a bundle?
- bool AlignToBundleEnd;
-
- uint8_t BundlePadding;
-
- /// LayoutOrder - The layout order of this fragment.
- unsigned LayoutOrder;
-
- /// The data for the section this fragment is in.
- MCSection *Parent;
-
- /// Atom - The atom this fragment is in, as represented by it's defining
- /// symbol.
- const MCSymbol *Atom;
-
- /// \name Assembler Backend Data
- /// @{
- //
- // FIXME: This could all be kept private to the assembler implementation.
-
- /// Offset - The offset of this fragment in its section. This is ~0 until
- /// initialized.
- uint64_t Offset;
-
- /// @}
-
-protected:
- MCFragment(FragmentType Kind, bool HasInstructions,
- uint8_t BundlePadding, MCSection *Parent = nullptr);
-
- ~MCFragment();
-private:
-
- // This is a friend so that the sentinal can be created.
- friend struct ilist_sentinel_traits<MCFragment>;
- MCFragment();
-
-public:
- /// Destroys the current fragment.
- ///
- /// This must be used instead of delete as MCFragment is non-virtual.
- /// This method will dispatch to the appropriate subclass.
- void destroy();
-
- FragmentType getKind() const { return Kind; }
-
- MCSection *getParent() const { return Parent; }
- void setParent(MCSection *Value) { Parent = Value; }
-
- const MCSymbol *getAtom() const { return Atom; }
- void setAtom(const MCSymbol *Value) { Atom = Value; }
-
- unsigned getLayoutOrder() const { return LayoutOrder; }
- void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
-
- /// \brief Does this fragment have instructions emitted into it? By default
- /// this is false, but specific fragment types may set it to true.
- bool hasInstructions() const { return HasInstructions; }
-
- /// \brief Should this fragment be placed at the end of an aligned bundle?
- bool alignToBundleEnd() const { return AlignToBundleEnd; }
- void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
-
- /// \brief Get the padding size that must be inserted before this fragment.
- /// Used for bundling. By default, no padding is inserted.
- /// Note that padding size is restricted to 8 bits. This is an optimization
- /// to reduce the amount of space used for each fragment. In practice, larger
- /// padding should never be required.
- uint8_t getBundlePadding() const { return BundlePadding; }
-
- /// \brief Set the padding size for this fragment. By default it's a no-op,
- /// and only some fragments have a meaningful implementation.
- void setBundlePadding(uint8_t N) { BundlePadding = N; }
-
- /// \brief Return true if given frgment has FT_Dummy type.
- bool isDummy() const { return Kind == FT_Dummy; }
-
- void dump();
-};
-
-class MCDummyFragment : public MCFragment {
-public:
- explicit MCDummyFragment(MCSection *Sec)
- : MCFragment(FT_Dummy, false, 0, Sec){};
- static bool classof(const MCFragment *F) { return F->getKind() == FT_Dummy; }
-};
-
-/// Interface implemented by fragments that contain encoded instructions and/or
-/// data.
-///
-class MCEncodedFragment : public MCFragment {
-protected:
- MCEncodedFragment(MCFragment::FragmentType FType, bool HasInstructions,
- MCSection *Sec)
- : MCFragment(FType, HasInstructions, 0, Sec) {}
-
-public:
- static bool classof(const MCFragment *F) {
- MCFragment::FragmentType Kind = F->getKind();
- switch (Kind) {
- default:
- return false;
- case MCFragment::FT_Relaxable:
- case MCFragment::FT_CompactEncodedInst:
- case MCFragment::FT_Data:
- return true;
- }
- }
-};
-
-/// Interface implemented by fragments that contain encoded instructions and/or
-/// data.
-///
-template<unsigned ContentsSize>
-class MCEncodedFragmentWithContents : public MCEncodedFragment {
- SmallVector<char, ContentsSize> Contents;
-
-protected:
- MCEncodedFragmentWithContents(MCFragment::FragmentType FType,
- bool HasInstructions,
- MCSection *Sec)
- : MCEncodedFragment(FType, HasInstructions, Sec) {}
-
-public:
- SmallVectorImpl<char> &getContents() { return Contents; }
- const SmallVectorImpl<char> &getContents() const { return Contents; }
-};
-
-/// Interface implemented by fragments that contain encoded instructions and/or
-/// data and also have fixups registered.
-///
-template<unsigned ContentsSize, unsigned FixupsSize>
-class MCEncodedFragmentWithFixups :
- public MCEncodedFragmentWithContents<ContentsSize> {
-
- /// Fixups - The list of fixups in this fragment.
- SmallVector<MCFixup, FixupsSize> Fixups;
-
-protected:
- MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
- bool HasInstructions,
- MCSection *Sec)
- : MCEncodedFragmentWithContents<ContentsSize>(FType, HasInstructions,
- Sec) {}
-
-public:
- typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
- typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
-
- SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
- const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
-
- fixup_iterator fixup_begin() { return Fixups.begin(); }
- const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
-
- fixup_iterator fixup_end() { return Fixups.end(); }
- const_fixup_iterator fixup_end() const { return Fixups.end(); }
-
- static bool classof(const MCFragment *F) {
- MCFragment::FragmentType Kind = F->getKind();
- return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data;
- }
-};
-
-/// Fragment for data and encoded instructions.
-///
-class MCDataFragment : public MCEncodedFragmentWithFixups<32, 4> {
-public:
- MCDataFragment(MCSection *Sec = nullptr)
- : MCEncodedFragmentWithFixups<32, 4>(FT_Data, false, Sec) {}
-
- void setHasInstructions(bool V) { HasInstructions = V; }
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Data;
- }
-};
-
-/// This is a compact (memory-size-wise) fragment for holding an encoded
-/// instruction (non-relaxable) that has no fixups registered. When applicable,
-/// it can be used instead of MCDataFragment and lead to lower memory
-/// consumption.
-///
-class MCCompactEncodedInstFragment : public MCEncodedFragmentWithContents<4> {
-public:
- MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
- : MCEncodedFragmentWithContents(FT_CompactEncodedInst, true, Sec) {
- }
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_CompactEncodedInst;
- }
-};
-
-/// A relaxable fragment holds on to its MCInst, since it may need to be
-/// relaxed during the assembler layout and relaxation stage.
-///
-class MCRelaxableFragment : public MCEncodedFragmentWithFixups<8, 1> {
-
- /// Inst - The instruction this is a fragment for.
- MCInst Inst;
-
- /// STI - The MCSubtargetInfo in effect when the instruction was encoded.
- const MCSubtargetInfo &STI;
-
-public:
- MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
- MCSection *Sec = nullptr)
- : MCEncodedFragmentWithFixups(FT_Relaxable, true, Sec),
- Inst(Inst), STI(STI) {}
-
- const MCInst &getInst() const { return Inst; }
- void setInst(const MCInst &Value) { Inst = Value; }
-
- const MCSubtargetInfo &getSubtargetInfo() { return STI; }
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Relaxable;
- }
-};
-
-class MCAlignFragment : public MCFragment {
-
- /// Alignment - The alignment to ensure, in bytes.
- unsigned Alignment;
-
- /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
- /// of using the provided value. The exact interpretation of this flag is
- /// target dependent.
- bool EmitNops : 1;
-
- /// Value - Value to use for filling padding bytes.
- int64_t Value;
-
- /// ValueSize - The size of the integer (in bytes) of \p Value.
- unsigned ValueSize;
-
- /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
- /// cannot be satisfied in this width then this fragment is ignored.
- unsigned MaxBytesToEmit;
-
-public:
- MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
- unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
- : MCFragment(FT_Align, false, 0, Sec), Alignment(Alignment),
- EmitNops(false), Value(Value),
- ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit) {}
-
- /// \name Accessors
- /// @{
-
- unsigned getAlignment() const { return Alignment; }
-
- int64_t getValue() const { return Value; }
-
- unsigned getValueSize() const { return ValueSize; }
-
- unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
-
- bool hasEmitNops() const { return EmitNops; }
- void setEmitNops(bool Value) { EmitNops = Value; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Align;
- }
-};
-
-class MCFillFragment : public MCFragment {
-
- /// Value - Value to use for filling bytes.
- int64_t Value;
-
- /// ValueSize - The size (in bytes) of \p Value to use when filling, or 0 if
- /// this is a virtual fill fragment.
- unsigned ValueSize;
-
- /// Size - The number of bytes to insert.
- uint64_t Size;
-
-public:
- MCFillFragment(int64_t Value, unsigned ValueSize, uint64_t Size,
- MCSection *Sec = nullptr)
- : MCFragment(FT_Fill, false, 0, Sec), Value(Value), ValueSize(ValueSize),
- Size(Size) {
- assert((!ValueSize || (Size % ValueSize) == 0) &&
- "Fill size must be a multiple of the value size!");
- }
-
- /// \name Accessors
- /// @{
-
- int64_t getValue() const { return Value; }
-
- unsigned getValueSize() const { return ValueSize; }
-
- uint64_t getSize() const { return Size; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Fill;
- }
-};
-
-class MCOrgFragment : public MCFragment {
-
- /// Offset - The offset this fragment should start at.
- const MCExpr *Offset;
-
- /// Value - Value to use for filling bytes.
- int8_t Value;
-
-public:
- MCOrgFragment(const MCExpr &Offset, int8_t Value, MCSection *Sec = nullptr)
- : MCFragment(FT_Org, false, 0, Sec), Offset(&Offset), Value(Value) {}
-
- /// \name Accessors
- /// @{
-
- const MCExpr &getOffset() const { return *Offset; }
-
- uint8_t getValue() const { return Value; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Org;
- }
-};
-
-class MCLEBFragment : public MCFragment {
-
- /// Value - The value this fragment should contain.
- const MCExpr *Value;
-
- /// IsSigned - True if this is a sleb128, false if uleb128.
- bool IsSigned;
-
- SmallString<8> Contents;
-
-public:
- MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
- : MCFragment(FT_LEB, false, 0, Sec), Value(&Value_), IsSigned(IsSigned_) {
- Contents.push_back(0);
- }
-
- /// \name Accessors
- /// @{
-
- const MCExpr &getValue() const { return *Value; }
-
- bool isSigned() const { return IsSigned; }
-
- SmallString<8> &getContents() { return Contents; }
- const SmallString<8> &getContents() const { return Contents; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_LEB;
- }
-};
-
-class MCDwarfLineAddrFragment : public MCFragment {
-
- /// LineDelta - the value of the difference between the two line numbers
- /// between two .loc dwarf directives.
- int64_t LineDelta;
-
- /// AddrDelta - The expression for the difference of the two symbols that
- /// make up the address delta between two .loc dwarf directives.
- const MCExpr *AddrDelta;
-
- SmallString<8> Contents;
-
-public:
- MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
- MCSection *Sec = nullptr)
- : MCFragment(FT_Dwarf, false, 0, Sec), LineDelta(LineDelta),
- AddrDelta(&AddrDelta) {
- Contents.push_back(0);
- }
-
- /// \name Accessors
- /// @{
-
- int64_t getLineDelta() const { return LineDelta; }
-
- const MCExpr &getAddrDelta() const { return *AddrDelta; }
-
- SmallString<8> &getContents() { return Contents; }
- const SmallString<8> &getContents() const { return Contents; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Dwarf;
- }
-};
-
-class MCDwarfCallFrameFragment : public MCFragment {
-
- /// AddrDelta - The expression for the difference of the two symbols that
- /// make up the address delta between two .cfi_* dwarf directives.
- const MCExpr *AddrDelta;
-
- SmallString<8> Contents;
-
-public:
- MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
- : MCFragment(FT_DwarfFrame, false, 0, Sec), AddrDelta(&AddrDelta) {
- Contents.push_back(0);
- }
-
- /// \name Accessors
- /// @{
-
- const MCExpr &getAddrDelta() const { return *AddrDelta; }
-
- SmallString<8> &getContents() { return Contents; }
- const SmallString<8> &getContents() const { return Contents; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_DwarfFrame;
- }
-};
-
-class MCSafeSEHFragment : public MCFragment {
- const MCSymbol *Sym;
-
-public:
- MCSafeSEHFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
- : MCFragment(FT_SafeSEH, false, 0, Sec), Sym(Sym) {}
-
- /// \name Accessors
- /// @{
-
- const MCSymbol *getSymbol() { return Sym; }
- const MCSymbol *getSymbol() const { return Sym; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_SafeSEH;
- }
-};
-
// FIXME: This really doesn't belong here. See comments below.
struct IndirectSymbolData {
MCSymbol *Symbol;
unsigned RelaxAll : 1;
unsigned SubsectionsViaSymbols : 1;
+ unsigned IncrementalLinkerCompatible : 1;
/// ELF specific e_header flags
// It would be good if there were an MCELFAssembler class to hold this.
bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
+ bool isIncrementalLinkerCompatible() const {
+ return IncrementalLinkerCompatible;
+ }
+ void setIncrementalLinkerCompatible(bool Value) {
+ IncrementalLinkerCompatible = Value;
+ }
+
bool getRelaxAll() const { return RelaxAll; }
void setRelaxAll(bool Value) { RelaxAll = Value; }
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