#ifndef LLVM_MC_MCASSEMBLER_H
#define LLVM_MC_MCASSEMBLER_H
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCInst.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/Support/Casting.h"
-#include "llvm/MC/MCFixup.h"
-#include "llvm/MC/MCInst.h"
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/DataTypes.h"
#include <vector> // FIXME: Shouldn't be needed.
namespace llvm {
class MCSymbol;
class MCSymbolData;
class MCValue;
-class TargetAsmBackend;
+class MCAsmBackend;
class MCFragment : public ilist_node<MCFragment> {
friend class MCAsmLayout;
FT_Inst,
FT_Org,
FT_Dwarf,
+ FT_DwarfFrame,
FT_LEB
};
/// initialized.
uint64_t Offset;
- /// EffectiveSize - The compute size of this section. This is ~0 until
- /// initialized.
- uint64_t EffectiveSize;
-
- /// LayoutOrder - The global layout order of this fragment. This is the index
- /// across all fragments in the file, not just within the section.
+ /// LayoutOrder - The layout order of this fragment.
unsigned LayoutOrder;
/// @}
/// target dependent.
bool EmitNops : 1;
- /// OnlyAlignAddress - Flag to indicate that this align is only used to adjust
- /// the address space size of a section and that it should not be included as
- /// part of the section size. This flag can only be used on the last fragment
- /// in a section.
- bool OnlyAlignAddress : 1;
-
public:
MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize,
unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
: MCFragment(FT_Align, SD), Alignment(_Alignment),
Value(_Value),ValueSize(_ValueSize),
- MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false),
- OnlyAlignAddress(false) {}
+ MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false) {}
/// @name Accessors
/// @{
bool hasEmitNops() const { return EmitNops; }
void setEmitNops(bool Value) { EmitNops = Value; }
- bool hasOnlyAlignAddress() const { return OnlyAlignAddress; }
- void setOnlyAlignAddress(bool Value) { OnlyAlignAddress = Value; }
-
/// @}
static bool classof(const MCFragment *F) {
/// IsSigned - True if this is a sleb128, false if uleb128.
bool IsSigned;
- /// Size - The current size estimate.
- uint64_t Size;
-
+ SmallString<8> Contents;
public:
MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD)
: MCFragment(FT_LEB, SD),
- Value(&Value_), IsSigned(IsSigned_), Size(1) {}
+ Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); }
/// @name Accessors
/// @{
bool isSigned() const { return IsSigned; }
- uint64_t getSize() const { return Size; }
-
- void setSize(uint64_t Size_) { Size = Size_; }
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
/// @}
/// make up the address delta between two .loc dwarf directives.
const MCExpr *AddrDelta;
+ SmallString<8> Contents;
+
public:
MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
- MCSectionData *SD = 0)
+ MCSectionData *SD)
: MCFragment(FT_Dwarf, SD),
- LineDelta(_LineDelta), AddrDelta(&_AddrDelta) {}
+ LineDelta(_LineDelta), 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) {
static bool classof(const MCDwarfLineAddrFragment *) { return true; }
};
+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, MCSectionData *SD)
+ : MCFragment(FT_DwarfFrame, SD),
+ 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;
+ }
+ static bool classof(const MCDwarfCallFrameFragment *) { return true; }
+};
+
// FIXME: Should this be a separate class, or just merged into MCSection? Since
// we anticipate the fast path being through an MCAssembler, the only reason to
// keep it out is for API abstraction.
//
// FIXME: This could all be kept private to the assembler implementation.
- /// Address - The computed address of this section. This is ~0 until
- /// initialized.
- uint64_t Address;
-
/// HasInstructions - Whether this section has had instructions emitted into
/// it.
unsigned HasInstructions : 1;
MCContext &Context;
- TargetAsmBackend &Backend;
+ MCAsmBackend &Backend;
MCCodeEmitter &Emitter;
+ MCObjectWriter &Writer;
+
raw_ostream &OS;
iplist<MCSectionData> Sections;
std::vector<IndirectSymbolData> IndirectSymbols;
+ /// The set of function symbols for which a .thumb_func directive has
+ /// been seen.
+ //
+ // FIXME: We really would like this in target specific code rather than
+ // here. Maybe when the relocation stuff moves to target specific,
+ // this can go with it? The streamer would need some target specific
+ // refactoring too.
+ SmallPtrSet<const MCSymbol*, 64> ThumbFuncs;
+
unsigned RelaxAll : 1;
+ unsigned NoExecStack : 1;
unsigned SubsectionsViaSymbols : 1;
- unsigned PadSectionToAlignment : 1;
private:
/// Evaluate a fixup to a relocatable expression and the value which should be
/// \param DF The fragment the fixup is inside.
/// \param Target [out] On return, the relocatable expression the fixup
/// evaluates to.
- /// \param Value [out] On return, the value of the fixup as currently layed
+ /// \param Value [out] On return, the value of the fixup as currently laid
/// out.
/// \return Whether the fixup value was fully resolved. This is true if the
/// \arg Value result is fixed, otherwise the value may change due to
/// relocation.
- bool EvaluateFixup(const MCObjectWriter &Writer, const MCAsmLayout &Layout,
+ bool EvaluateFixup(const MCAsmLayout &Layout,
const MCFixup &Fixup, const MCFragment *DF,
MCValue &Target, uint64_t &Value) const;
/// Check whether a fixup can be satisfied, or whether it needs to be relaxed
/// (increased in size, in order to hold its value correctly).
- bool FixupNeedsRelaxation(const MCObjectWriter &Writer,
- const MCFixup &Fixup, const MCFragment *DF,
+ bool FixupNeedsRelaxation(const MCFixup &Fixup, const MCFragment *DF,
const MCAsmLayout &Layout) const;
/// Check whether the given fragment needs relaxation.
- bool FragmentNeedsRelaxation(const MCObjectWriter &Writer,
- const MCInstFragment *IF,
+ bool FragmentNeedsRelaxation(const MCInstFragment *IF,
const MCAsmLayout &Layout) const;
- /// Compute the effective fragment size assuming it is layed out at the given
- /// \arg SectionAddress and \arg FragmentOffset.
- uint64_t ComputeFragmentSize(MCAsmLayout &Layout, const MCFragment &F,
- uint64_t SectionAddress,
- uint64_t FragmentOffset) const;
-
/// LayoutOnce - Perform one layout iteration and return true if any offsets
/// were adjusted.
- bool LayoutOnce(const MCObjectWriter &Writer, MCAsmLayout &Layout);
+ bool LayoutOnce(MCAsmLayout &Layout);
+
+ bool LayoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD);
- bool RelaxInstruction(const MCObjectWriter &Writer, MCAsmLayout &Layout,
- MCInstFragment &IF);
+ bool RelaxInstruction(MCAsmLayout &Layout, MCInstFragment &IF);
- bool RelaxLEB(const MCObjectWriter &Writer, MCAsmLayout &Layout,
- MCLEBFragment &IF);
+ bool RelaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
+
+ bool RelaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
+ bool RelaxDwarfCallFrameFragment(MCAsmLayout &Layout,
+ MCDwarfCallFrameFragment &DF);
/// FinishLayout - Finalize a layout, including fragment lowering.
void FinishLayout(MCAsmLayout &Layout);
+ uint64_t HandleFixup(const MCAsmLayout &Layout,
+ MCFragment &F, const MCFixup &Fixup);
+
public:
+ /// Compute the effective fragment size assuming it is laid out at the given
+ /// \arg SectionAddress and \arg FragmentOffset.
+ uint64_t ComputeFragmentSize(const MCAsmLayout &Layout, const MCFragment &F) const;
+
/// Find the symbol which defines the atom containing the given symbol, or
/// null if there is no such symbol.
const MCSymbolData *getAtom(const MCSymbolData *Symbol) const;
bool isSymbolLinkerVisible(const MCSymbol &SD) const;
/// Emit the section contents using the given object writer.
- //
- // FIXME: Should MCAssembler always have a reference to the object writer?
- void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout,
- MCObjectWriter *OW) const;
+ void WriteSectionData(const MCSectionData *Section,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether a given symbol has been flagged with .thumb_func.
+ bool isThumbFunc(const MCSymbol *Func) const {
+ return ThumbFuncs.count(Func);
+ }
- void AddSectionToTheEnd(const MCObjectWriter &Writer, MCSectionData &SD,
- MCAsmLayout &Layout);
+ /// Flag a function symbol as the target of a .thumb_func directive.
+ void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
public:
/// Construct a new assembler instance.
// concrete and require clients to pass in a target like object. The other
// option is to make this abstract, and have targets provide concrete
// implementations as we do with AsmParser.
- MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend,
- MCCodeEmitter &_Emitter, bool _PadSectionToAlignment,
+ MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
+ MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
raw_ostream &OS);
~MCAssembler();
MCContext &getContext() const { return Context; }
- TargetAsmBackend &getBackend() const { return Backend; }
+ MCAsmBackend &getBackend() const { return Backend; }
MCCodeEmitter &getEmitter() const { return Emitter; }
+ MCObjectWriter &getWriter() const { return Writer; }
+
/// Finish - Do final processing and write the object to the output stream.
/// \arg Writer is used for custom object writer (as the MCJIT does),
/// if not specified it is automatically created from backend.
- void Finish(MCObjectWriter *Writer = 0);
+ void Finish();
// FIXME: This does not belong here.
bool getSubsectionsViaSymbols() const {
bool getRelaxAll() const { return RelaxAll; }
void setRelaxAll(bool Value) { RelaxAll = Value; }
+ bool getNoExecStack() const { return NoExecStack; }
+ void setNoExecStack(bool Value) { NoExecStack = Value; }
+
/// @name Section List Access
/// @{
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