#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 <vector> // FIXME: Shouldn't be needed.
class MCAsmLayout;
class MCAssembler;
class MCContext;
+class MCCodeEmitter;
class MCExpr;
class MCFragment;
+class MCObjectWriter;
class MCSection;
class MCSectionData;
class MCSymbol;
+class MCSymbolData;
class MCValue;
class TargetAsmBackend;
/// MCAsmFixup - Represent a fixed size region of bytes inside some fragment
/// which needs to be rewritten. This region will either be rewritten by the
/// assembler or cause a relocation entry to be generated.
-struct MCAsmFixup {
+//
+// FIXME: This should probably just be merged with MCFixup.
+class MCAsmFixup {
/// Offset - The offset inside the fragment which needs to be rewritten.
uint64_t Offset;
/// Kind - The fixup kind.
MCFixupKind Kind;
- /// FixedValue - The value to replace the fix up by.
- //
- // FIXME: This should not be here.
- uint64_t FixedValue;
-
public:
MCAsmFixup(uint64_t _Offset, const MCExpr &_Value, MCFixupKind _Kind)
- : Offset(_Offset), Value(&_Value), Kind(_Kind), FixedValue(0) {}
+ : Offset(_Offset), Value(&_Value), Kind(_Kind) {}
+
+ MCFixupKind getKind() const { return MCFixupKind(Kind); }
+
+ uint64_t getOffset() const { return Offset; }
+ void setOffset(uint64_t Value) { Offset = Value; }
+
+ const MCExpr *getValue() const { return Value; }
};
class MCFragment : public ilist_node<MCFragment> {
+ friend class MCAsmLayout;
+
MCFragment(const MCFragment&); // DO NOT IMPLEMENT
void operator=(const MCFragment&); // DO NOT IMPLEMENT
public:
enum FragmentType {
- FT_Data,
FT_Align,
+ FT_Data,
FT_Fill,
- FT_Org,
- FT_ZeroFill
+ FT_Inst,
+ FT_Org
};
private:
/// Parent - The data for the section this fragment is in.
MCSectionData *Parent;
+ /// Atom - The atom this fragment is in, as represented by it's defining
+ /// symbol. Atom's are only used by backends which set
+ /// \see MCAsmBackend::hasReliableSymbolDifference().
+ MCSymbolData *Atom;
+
/// @name Assembler Backend Data
/// @{
//
/// initialized.
uint64_t Offset;
- /// FileSize - The file size of this section. This is ~0 until initialized.
- uint64_t FileSize;
+ /// 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.
+ unsigned LayoutOrder;
/// @}
public:
// Only for sentinel.
MCFragment();
- virtual ~MCFragment();
FragmentType getKind() const { return Kind; }
MCSectionData *getParent() const { return Parent; }
void setParent(MCSectionData *Value) { Parent = Value; }
- // FIXME: This should be abstract, fix sentinel.
- virtual uint64_t getMaxFileSize() const {
- assert(0 && "Invalid getMaxFileSize call!");
- return 0;
- }
-
- /// @name Assembler Backend Support
- /// @{
- //
- // FIXME: This could all be kept private to the assembler implementation.
-
- uint64_t getAddress() const;
-
- uint64_t getFileSize() const {
- assert(FileSize != ~UINT64_C(0) && "File size not set!");
- return FileSize;
- }
- void setFileSize(uint64_t Value) {
- assert(Value <= getMaxFileSize() && "Invalid file size!");
- FileSize = Value;
- }
-
- uint64_t getOffset() const {
- assert(Offset != ~UINT64_C(0) && "File offset not set!");
- return Offset;
- }
- void setOffset(uint64_t Value) { Offset = Value; }
+ MCSymbolData *getAtom() const { return Atom; }
+ void setAtom(MCSymbolData *Value) { Atom = Value; }
- /// @}
+ unsigned getLayoutOrder() const { return LayoutOrder; }
+ void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
static bool classof(const MCFragment *O) { return true; }
- virtual void dump();
+ void dump();
};
class MCDataFragment : public MCFragment {
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return Contents.size();
- }
-
SmallString<32> &getContents() { return Contents; }
const SmallString<32> &getContents() const { return Contents; }
/// @}
-
/// @name Fixup Access
/// @{
void addFixup(MCAsmFixup Fixup) {
// Enforce invariant that fixups are in offset order.
- assert(Fixups.empty() || Fixup.Offset > Fixups.back().Offset &&
+ assert((Fixups.empty() || Fixup.getOffset() > Fixups.back().getOffset()) &&
"Fixups must be added in order!");
Fixups.push_back(Fixup);
}
return F->getKind() == MCFragment::FT_Data;
}
static bool classof(const MCDataFragment *) { return true; }
+};
+
+// FIXME: This current incarnation of MCInstFragment doesn't make much sense, as
+// it is almost entirely a duplicate of MCDataFragment. If we decide to stick
+// with this approach (as opposed to making MCInstFragment a very light weight
+// object with just the MCInst and a code size, then we should just change
+// MCDataFragment to have an optional MCInst at its end.
+class MCInstFragment : public MCFragment {
+ /// Inst - The instruction this is a fragment for.
+ MCInst Inst;
+
+ /// InstSize - The size of the currently encoded instruction.
+ SmallString<8> Code;
+
+ /// Fixups - The list of fixups in this fragment.
+ SmallVector<MCAsmFixup, 1> Fixups;
+
+public:
+ typedef SmallVectorImpl<MCAsmFixup>::const_iterator const_fixup_iterator;
+ typedef SmallVectorImpl<MCAsmFixup>::iterator fixup_iterator;
- virtual void dump();
+public:
+ MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
+ : MCFragment(FT_Inst, SD), Inst(_Inst) {
+ }
+
+ /// @name Accessors
+ /// @{
+
+ SmallVectorImpl<char> &getCode() { return Code; }
+ const SmallVectorImpl<char> &getCode() const { return Code; }
+
+ unsigned getInstSize() const { return Code.size(); }
+
+ MCInst &getInst() { return Inst; }
+ const MCInst &getInst() const { return Inst; }
+
+ void setInst(MCInst Value) { Inst = Value; }
+
+ /// @}
+ /// @name Fixup Access
+ /// @{
+
+ SmallVectorImpl<MCAsmFixup> &getFixups() { return Fixups; }
+ const SmallVectorImpl<MCAsmFixup> &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();}
+
+ size_t fixup_size() const { return Fixups.size(); }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Inst;
+ }
+ static bool classof(const MCInstFragment *) { return true; }
};
class MCAlignFragment : public MCFragment {
/// cannot be satisfied in this width then this fragment is ignored.
unsigned MaxBytesToEmit;
- /// EmitNops - true when aligning code and optimal nops to be used for
- /// filling.
- bool EmitNops;
+ /// 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;
+
+ /// 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, bool _EmitNops,
- MCSectionData *SD = 0)
+ unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
: MCFragment(FT_Align, SD), Alignment(_Alignment),
Value(_Value),ValueSize(_ValueSize),
- MaxBytesToEmit(_MaxBytesToEmit), EmitNops(_EmitNops) {}
+ MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false),
+ OnlyAlignAddress(false) {}
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return std::max(Alignment - 1, MaxBytesToEmit);
- }
-
unsigned getAlignment() const { return Alignment; }
int64_t getValue() const { return Value; }
unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
- unsigned getEmitNops() const { return EmitNops; }
+ bool hasEmitNops() const { return EmitNops; }
+ void setEmitNops(bool Value) { EmitNops = Value; }
+
+ bool hasOnlyAlignAddress() const { return OnlyAlignAddress; }
+ void setOnlyAlignAddress(bool Value) { OnlyAlignAddress = Value; }
/// @}
return F->getKind() == MCFragment::FT_Align;
}
static bool classof(const MCAlignFragment *) { return true; }
-
- virtual void dump();
};
class MCFillFragment : public MCFragment {
/// Value - Value to use for filling bytes.
int64_t Value;
- /// ValueSize - The size (in bytes) of \arg Value to use when filling.
+ /// ValueSize - The size (in bytes) of \arg Value to use when filling, or 0 if
+ /// this is a virtual fill fragment.
unsigned ValueSize;
- /// Count - The number of copies of \arg Value to insert.
- uint64_t Count;
+ /// Size - The number of bytes to insert.
+ uint64_t Size;
public:
- MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Count,
+ MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Size,
MCSectionData *SD = 0)
: MCFragment(FT_Fill, SD),
- Value(_Value), ValueSize(_ValueSize), Count(_Count) {}
+ Value(_Value), ValueSize(_ValueSize), Size(_Size) {
+ assert((!ValueSize || (Size % ValueSize) == 0) &&
+ "Fill size must be a multiple of the value size!");
+ }
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- return ValueSize * Count;
- }
-
int64_t getValue() const { return Value; }
unsigned getValueSize() const { return ValueSize; }
- uint64_t getCount() const { return Count; }
+ uint64_t getSize() const { return Size; }
/// @}
return F->getKind() == MCFragment::FT_Fill;
}
static bool classof(const MCFillFragment *) { return true; }
-
- virtual void dump();
};
class MCOrgFragment : public MCFragment {
/// @name Accessors
/// @{
- uint64_t getMaxFileSize() const {
- // FIXME: This doesn't make much sense.
- return ~UINT64_C(0);
- }
-
const MCExpr &getOffset() const { return *Offset; }
uint8_t getValue() const { return Value; }
return F->getKind() == MCFragment::FT_Org;
}
static bool classof(const MCOrgFragment *) { return true; }
-
- virtual void dump();
-};
-
-/// MCZeroFillFragment - Represent data which has a fixed size and alignment,
-/// but requires no physical space in the object file.
-class MCZeroFillFragment : public MCFragment {
- /// Size - The size of this fragment.
- uint64_t Size;
-
- /// Alignment - The alignment for this fragment.
- unsigned Alignment;
-
-public:
- MCZeroFillFragment(uint64_t _Size, unsigned _Alignment, MCSectionData *SD = 0)
- : MCFragment(FT_ZeroFill, SD),
- Size(_Size), Alignment(_Alignment) {}
-
- /// @name Accessors
- /// @{
-
- uint64_t getMaxFileSize() const {
- // FIXME: This also doesn't make much sense, this method is misnamed.
- return ~UINT64_C(0);
- }
-
- uint64_t getSize() const { return Size; }
-
- unsigned getAlignment() const { return Alignment; }
-
- /// @}
-
- static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_ZeroFill;
- }
- static bool classof(const MCZeroFillFragment *) { return true; }
-
- virtual void dump();
};
// 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.
class MCSectionData : public ilist_node<MCSectionData> {
+ friend class MCAsmLayout;
+
MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT
void operator=(const MCSectionData&); // DO NOT IMPLEMENT
iplist<MCFragment> Fragments;
const MCSection *Section;
+ /// Ordinal - The section index in the assemblers section list.
+ unsigned Ordinal;
+
+ /// LayoutOrder - The index of this section in the layout order.
+ unsigned LayoutOrder;
+
/// Alignment - The maximum alignment seen in this section.
unsigned Alignment;
/// initialized.
uint64_t Address;
- /// Size - The content size of this section. This is ~0 until initialized.
- uint64_t Size;
-
- /// FileSize - The size of this section in the object file. This is ~0 until
- /// initialized.
- uint64_t FileSize;
-
/// HasInstructions - Whether this section has had instructions emitted into
/// it.
unsigned HasInstructions : 1;
unsigned getAlignment() const { return Alignment; }
void setAlignment(unsigned Value) { Alignment = Value; }
+ bool hasInstructions() const { return HasInstructions; }
+ void setHasInstructions(bool Value) { HasInstructions = Value; }
+
+ unsigned getOrdinal() const { return Ordinal; }
+ void setOrdinal(unsigned Value) { Ordinal = Value; }
+
+ unsigned getLayoutOrder() const { return LayoutOrder; }
+ void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
+
/// @name Fragment Access
/// @{
bool empty() const { return Fragments.empty(); }
- /// @}
- /// @name Assembler Backend Support
- /// @{
- //
- // FIXME: This could all be kept private to the assembler implementation.
-
- uint64_t getAddress() const {
- assert(Address != ~UINT64_C(0) && "Address not set!");
- return Address;
- }
- void setAddress(uint64_t Value) { Address = Value; }
-
- uint64_t getSize() const {
- assert(Size != ~UINT64_C(0) && "File size not set!");
- return Size;
- }
- void setSize(uint64_t Value) { Size = Value; }
-
- uint64_t getFileSize() const {
- assert(FileSize != ~UINT64_C(0) && "File size not set!");
- return FileSize;
- }
- void setFileSize(uint64_t Value) { FileSize = Value; }
-
- bool hasInstructions() const { return HasInstructions; }
- void setHasInstructions(bool Value) { HasInstructions = Value; }
+ void dump();
/// @}
-
- void dump();
};
// FIXME: Same concerns as with SectionData.
uint64_t getOffset() const { return Offset; }
void setOffset(uint64_t Value) { Offset = Value; }
- uint64_t getAddress() const {
- assert(getFragment() && "Invalid getAddress() on undefined symbol!");
- return getFragment()->getAddress() + getOffset();
- }
-
/// @}
/// @name Symbol Attributes
/// @{
/// setFlags - Set the (implementation defined) symbol flags.
void setFlags(uint32_t Value) { Flags = Value; }
+ /// modifyFlags - Modify the flags via a mask
+ void modifyFlags(uint32_t Value, uint32_t Mask) {
+ Flags = (Flags & ~Mask) | Value;
+ }
+
/// getIndex - Get the (implementation defined) index.
uint64_t getIndex() const { return Index; }
};
class MCAssembler {
+ friend class MCAsmLayout;
+
public:
typedef iplist<MCSectionData> SectionDataListType;
typedef iplist<MCSymbolData> SymbolDataListType;
typedef SymbolDataListType::const_iterator const_symbol_iterator;
typedef SymbolDataListType::iterator symbol_iterator;
+ typedef std::vector<IndirectSymbolData>::const_iterator
+ const_indirect_symbol_iterator;
typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
private:
TargetAsmBackend &Backend;
+ MCCodeEmitter &Emitter;
+
raw_ostream &OS;
iplist<MCSectionData> Sections;
std::vector<IndirectSymbolData> IndirectSymbols;
+ unsigned RelaxAll : 1;
unsigned SubsectionsViaSymbols : 1;
private:
- /// LayoutSection - Assign offsets and sizes to the fragments in the section
- /// \arg SD, and update the section size. The section file offset should
- /// already have been computed.
- void LayoutSection(MCSectionData &SD);
-
- // FIXME: Make protected once we factor out object writer classes.
-public:
/// Evaluate a fixup to a relocatable expression and the value which should be
/// placed into the fixup.
///
/// \arg Value result is fixed, otherwise the value may change due to
/// relocation.
bool EvaluateFixup(const MCAsmLayout &Layout,
- MCAsmFixup &Fixup, MCDataFragment *DF,
+ const MCAsmFixup &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 MCAsmFixup &Fixup, const MCFragment *DF,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether the given fragment needs relaxation.
+ 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(MCAsmLayout &Layout);
+
+ /// FinishLayout - Finalize a layout, including fragment lowering.
+ void FinishLayout(MCAsmLayout &Layout);
+
+public:
+ /// Find the symbol which defines the atom containing the given symbol, or
+ /// null if there is no such symbol.
+ const MCSymbolData *getAtom(const MCAsmLayout &Layout,
+ const MCSymbolData *Symbol) const;
+
+ /// Check whether a particular symbol is visible to the linker and is required
+ /// in the symbol table, or whether it can be discarded by the assembler. This
+ /// also effects whether the assembler treats the label as potentially
+ /// defining a separate atom.
+ bool isSymbolLinkerVisible(const MCSymbolData *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;
+
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, raw_ostream &OS);
+ MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend,
+ MCCodeEmitter &_Emitter, raw_ostream &OS);
~MCAssembler();
MCContext &getContext() const { return Context; }
TargetAsmBackend &getBackend() const { return Backend; }
+ MCCodeEmitter &getEmitter() const { return Emitter; }
+
/// Finish - Do final processing and write the object to the output stream.
void Finish();
SubsectionsViaSymbols = Value;
}
+ bool getRelaxAll() const { return RelaxAll; }
+ void setRelaxAll(bool Value) { RelaxAll = Value; }
+
/// @name Section List Access
/// @{
indirect_symbol_iterator indirect_symbol_begin() {
return IndirectSymbols.begin();
}
+ const_indirect_symbol_iterator indirect_symbol_begin() const {
+ return IndirectSymbols.begin();
+ }
indirect_symbol_iterator indirect_symbol_end() {
return IndirectSymbols.end();
}
+ const_indirect_symbol_iterator indirect_symbol_end() const {
+ return IndirectSymbols.end();
+ }
size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
projects / oota-llvm.git / blobdiff