#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/MC/MCFixup.h"
+#include "llvm/MC/MCInst.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataTypes.h"
#include <vector> // FIXME: Shouldn't be needed.
enum FragmentType {
FT_Align,
FT_Data,
+ FT_CompactEncodedInst,
FT_Fill,
- FT_Inst,
+ FT_Relaxable,
FT_Org,
FT_Dwarf,
FT_DwarfFrame,
unsigned getLayoutOrder() const { return LayoutOrder; }
void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
- static bool classof(const MCFragment *O) { return true; }
+ /// \brief Does this fragment have instructions emitted into it? By default
+ /// this is false, but specific fragment types may set it to true.
+ virtual bool hasInstructions() const { return false; }
+
+ /// \brief Should this fragment be placed at the end of an aligned bundle?
+ virtual bool alignToBundleEnd() const { return false; }
+ virtual void setAlignToBundleEnd(bool 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.
+ virtual uint8_t getBundlePadding() const {
+ return 0;
+ }
+
+ /// \brief Set the padding size for this fragment. By default it's a no-op,
+ /// and only some fragments have a meaningful implementation.
+ virtual void setBundlePadding(uint8_t N) {
+ }
void dump();
};
-class MCDataFragment : public MCFragment {
+/// Interface implemented by fragments that contain encoded instructions and/or
+/// data.
+///
+class MCEncodedFragment : public MCFragment {
virtual void anchor();
- SmallString<32> Contents;
-
- /// Fixups - The list of fixups in this fragment.
- std::vector<MCFixup> Fixups;
+ uint8_t BundlePadding;
public:
- typedef std::vector<MCFixup>::const_iterator const_fixup_iterator;
- typedef std::vector<MCFixup>::iterator fixup_iterator;
+ MCEncodedFragment(MCFragment::FragmentType FType, MCSectionData *SD = 0)
+ : MCFragment(FType, SD), BundlePadding(0)
+ {
+ }
+ virtual ~MCEncodedFragment();
+
+ virtual SmallVectorImpl<char> &getContents() = 0;
+ virtual const SmallVectorImpl<char> &getContents() const = 0;
+
+ virtual uint8_t getBundlePadding() const {
+ return BundlePadding;
+ }
+
+ virtual void setBundlePadding(uint8_t N) {
+ BundlePadding = N;
+ }
+
+ 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 and also have fixups registered.
+///
+class MCEncodedFragmentWithFixups : public MCEncodedFragment {
+ virtual void anchor();
public:
- MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {}
+ MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
+ MCSectionData *SD = 0)
+ : MCEncodedFragment(FType, SD)
+ {
+ }
- /// @name Accessors
- /// @{
+ virtual ~MCEncodedFragmentWithFixups();
- SmallString<32> &getContents() { return Contents; }
- const SmallString<32> &getContents() const { return Contents; }
+ typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
+ typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
- /// @}
- /// @name Fixup Access
- /// @{
+ virtual SmallVectorImpl<MCFixup> &getFixups() = 0;
+ virtual const SmallVectorImpl<MCFixup> &getFixups() const = 0;
- void addFixup(MCFixup Fixup) {
- // Enforce invariant that fixups are in offset order.
- assert((Fixups.empty() || Fixup.getOffset() >= Fixups.back().getOffset()) &&
- "Fixups must be added in order!");
- Fixups.push_back(Fixup);
+ virtual fixup_iterator fixup_begin() = 0;
+ virtual const_fixup_iterator fixup_begin() const = 0;
+ virtual fixup_iterator fixup_end() = 0;
+ virtual const_fixup_iterator fixup_end() const = 0;
+
+ 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 {
+ virtual void anchor();
+
+ /// \brief Does this fragment contain encoded instructions anywhere in it?
+ bool HasInstructions;
+
+ /// \brief Should this fragment be aligned to the end of a bundle?
+ bool AlignToBundleEnd;
+
+ SmallVector<char, 32> Contents;
+
+ /// Fixups - The list of fixups in this fragment.
+ SmallVector<MCFixup, 4> Fixups;
+public:
+ MCDataFragment(MCSectionData *SD = 0)
+ : MCEncodedFragmentWithFixups(FT_Data, SD),
+ HasInstructions(false), AlignToBundleEnd(false)
+ {
+ }
+
+ virtual SmallVectorImpl<char> &getContents() { return Contents; }
+ virtual const SmallVectorImpl<char> &getContents() const { return Contents; }
+
+ SmallVectorImpl<MCFixup> &getFixups() {
+ return Fixups;
+ }
+
+ const SmallVectorImpl<MCFixup> &getFixups() const {
+ return Fixups;
}
- std::vector<MCFixup> &getFixups() { return Fixups; }
- const std::vector<MCFixup> &getFixups() const { return Fixups; }
+ virtual bool hasInstructions() const { return HasInstructions; }
+ virtual void setHasInstructions(bool V) { HasInstructions = V; }
+
+ virtual bool alignToBundleEnd() const { return AlignToBundleEnd; }
+ virtual void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
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_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 MCEncodedFragment {
+ virtual void anchor();
- /// @}
+ /// \brief Should this fragment be aligned to the end of a bundle?
+ bool AlignToBundleEnd;
+
+ SmallVector<char, 4> Contents;
+public:
+ MCCompactEncodedInstFragment(MCSectionData *SD = 0)
+ : MCEncodedFragment(FT_CompactEncodedInst, SD), AlignToBundleEnd(false)
+ {
+ }
+
+ virtual bool hasInstructions() const {
+ return true;
+ }
+
+ virtual SmallVectorImpl<char> &getContents() { return Contents; }
+ virtual const SmallVectorImpl<char> &getContents() const { return Contents; }
+
+ virtual bool alignToBundleEnd() const { return AlignToBundleEnd; }
+ virtual void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
static bool classof(const MCFragment *F) {
- return F->getKind() == MCFragment::FT_Data;
+ return F->getKind() == MCFragment::FT_CompactEncodedInst;
}
- 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 {
+/// 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 {
virtual void anchor();
/// Inst - The instruction this is a fragment for.
MCInst Inst;
- /// Code - Binary data for the currently encoded instruction.
- SmallString<8> Code;
+ /// Contents - Binary data for the currently encoded instruction.
+ SmallVector<char, 8> Contents;
/// Fixups - The list of fixups in this fragment.
SmallVector<MCFixup, 1> Fixups;
public:
- typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
- typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
-
-public:
- MCInstFragment(const MCInst &_Inst, MCSectionData *SD = 0)
- : MCFragment(FT_Inst, SD), Inst(_Inst) {
+ MCRelaxableFragment(const MCInst &_Inst, MCSectionData *SD = 0)
+ : MCEncodedFragmentWithFixups(FT_Relaxable, SD), Inst(_Inst) {
}
- /// @name Accessors
- /// @{
+ virtual SmallVectorImpl<char> &getContents() { return Contents; }
+ virtual const SmallVectorImpl<char> &getContents() const { return Contents; }
- 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(const MCInst& Value) { Inst = Value; }
- /// @}
- /// @name Fixup Access
- /// @{
+ SmallVectorImpl<MCFixup> &getFixups() {
+ return Fixups;
+ }
- SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
- const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
+ const SmallVectorImpl<MCFixup> &getFixups() const {
+ return Fixups;
+ }
+
+ virtual bool hasInstructions() const { return true; }
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;
+ return F->getKind() == MCFragment::FT_Relaxable;
}
- static bool classof(const MCInstFragment *) { return true; }
};
class MCAlignFragment : public MCFragment {
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_Align;
}
- static bool classof(const MCAlignFragment *) { return true; }
};
class MCFillFragment : public MCFragment {
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_Fill;
}
- static bool classof(const MCFillFragment *) { return true; }
};
class MCOrgFragment : public MCFragment {
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_Org;
}
- static bool classof(const MCOrgFragment *) { return true; }
};
class MCLEBFragment : public MCFragment {
SmallString<8> Contents;
public:
- MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD)
+ MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD = 0)
: MCFragment(FT_LEB, SD),
Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); }
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_LEB;
}
- static bool classof(const MCLEBFragment *) { return true; }
};
class MCDwarfLineAddrFragment : public MCFragment {
public:
MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
- MCSectionData *SD)
+ MCSectionData *SD = 0)
: MCFragment(FT_Dwarf, SD),
LineDelta(_LineDelta), AddrDelta(&_AddrDelta) { Contents.push_back(0); }
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_Dwarf;
}
- static bool classof(const MCDwarfLineAddrFragment *) { return true; }
};
class MCDwarfCallFrameFragment : public MCFragment {
SmallString<8> Contents;
public:
- MCDwarfCallFrameFragment(const MCExpr &_AddrDelta, MCSectionData *SD)
+ MCDwarfCallFrameFragment(const MCExpr &_AddrDelta, MCSectionData *SD = 0)
: MCFragment(FT_DwarfFrame, SD),
AddrDelta(&_AddrDelta) { Contents.push_back(0); }
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
class MCSectionData : public ilist_node<MCSectionData> {
friend class MCAsmLayout;
- MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT
- void operator=(const MCSectionData&); // DO NOT IMPLEMENT
+ MCSectionData(const MCSectionData&) LLVM_DELETED_FUNCTION;
+ void operator=(const MCSectionData&) LLVM_DELETED_FUNCTION;
public:
typedef iplist<MCFragment> FragmentListType;
typedef FragmentListType::const_reverse_iterator const_reverse_iterator;
typedef FragmentListType::reverse_iterator reverse_iterator;
+ /// \brief Express the state of bundle locked groups while emitting code.
+ enum BundleLockStateType {
+ NotBundleLocked,
+ BundleLocked,
+ BundleLockedAlignToEnd
+ };
private:
FragmentListType Fragments;
const MCSection *Section;
/// Alignment - The maximum alignment seen in this section.
unsigned Alignment;
+ /// \brief Keeping track of bundle-locked state.
+ BundleLockStateType BundleLockState;
+
+ /// \brief We've seen a bundle_lock directive but not its first instruction
+ /// yet.
+ bool BundleGroupBeforeFirstInst;
+
/// @name Assembler Backend Data
/// @{
//
/// it.
unsigned HasInstructions : 1;
+ /// Mapping from subsection number to insertion point for subsection numbers
+ /// below that number.
+ SmallVector<std::pair<unsigned, MCFragment *>, 1> SubsectionFragmentMap;
+
/// @}
public:
bool empty() const { return Fragments.empty(); }
+ iterator getSubsectionInsertionPoint(unsigned Subsection);
+
+ bool isBundleLocked() const {
+ return BundleLockState != NotBundleLocked;
+ }
+
+ BundleLockStateType getBundleLockState() const {
+ return BundleLockState;
+ }
+
+ void setBundleLockState(BundleLockStateType NewState) {
+ BundleLockState = NewState;
+ }
+
+ bool isBundleGroupBeforeFirstInst() const {
+ return BundleGroupBeforeFirstInst;
+ }
+
+ void setBundleGroupBeforeFirstInst(bool IsFirst) {
+ BundleGroupBeforeFirstInst = IsFirst;
+ }
+
void dump();
/// @}
typedef std::vector<DataRegionData>::iterator data_region_iterator;
private:
- MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT
- void operator=(const MCAssembler&); // DO NOT IMPLEMENT
+ MCAssembler(const MCAssembler&) LLVM_DELETED_FUNCTION;
+ void operator=(const MCAssembler&) LLVM_DELETED_FUNCTION;
MCContext &Context;
std::vector<IndirectSymbolData> IndirectSymbols;
std::vector<DataRegionData> DataRegions;
+
+ /// The list of linker options to propagate into the object file.
+ std::vector<std::vector<std::string> > LinkerOptions;
+
/// The set of function symbols for which a .thumb_func directive has
/// been seen.
//
// refactoring too.
SmallPtrSet<const MCSymbol*, 64> ThumbFuncs;
+ /// \brief The bundle alignment size currently set in the assembler.
+ ///
+ /// By default it's 0, which means bundling is disabled.
+ unsigned BundleAlignSize;
+
unsigned RelaxAll : 1;
unsigned NoExecStack : 1;
unsigned SubsectionsViaSymbols : 1;
+ /// ELF specific e_header flags
+ // It would be good if there were an MCELFAssembler class to hold this.
+ // ELF header flags are used both by the integrated and standalone assemblers.
+ // Access to the flags is necessary in cases where assembler directives affect
+ // which flags to be set.
+ unsigned ELFHeaderEFlags;
private:
/// Evaluate a fixup to a relocatable expression and the value which should be
/// placed into the fixup.
/// 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 MCFixup &Fixup, const MCInstFragment *DF,
+ bool fixupNeedsRelaxation(const MCFixup &Fixup, const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const;
/// Check whether the given fragment needs relaxation.
- bool fragmentNeedsRelaxation(const MCInstFragment *IF,
+ bool fragmentNeedsRelaxation(const MCRelaxableFragment *IF,
const MCAsmLayout &Layout) const;
- /// layoutOnce - Perform one layout iteration and return true if any offsets
+ /// \brief Perform one layout iteration and return true if any offsets
/// were adjusted.
bool layoutOnce(MCAsmLayout &Layout);
+ /// \brief Perform one layout iteration of the given section and return true
+ /// if any offsets were adjusted.
bool layoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD);
- bool relaxInstruction(MCAsmLayout &Layout, MCInstFragment &IF);
+ bool relaxInstruction(MCAsmLayout &Layout, MCRelaxableFragment &IF);
bool relaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
/// Flag a function symbol as the target of a .thumb_func directive.
void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
+ /// ELF e_header flags
+ unsigned getELFHeaderEFlags() const {return ELFHeaderEFlags;}
+ void setELFHeaderEFlags(unsigned Flags) { ELFHeaderEFlags = Flags;}
+
public:
/// Construct a new assembler instance.
///
raw_ostream &OS);
~MCAssembler();
+ /// Reuse an assembler instance
+ ///
+ void reset();
+
MCContext &getContext() const { return Context; }
MCAsmBackend &getBackend() const { return Backend; }
bool getNoExecStack() const { return NoExecStack; }
void setNoExecStack(bool Value) { NoExecStack = Value; }
+ bool isBundlingEnabled() const {
+ return BundleAlignSize != 0;
+ }
+
+ unsigned getBundleAlignSize() const {
+ return BundleAlignSize;
+ }
+
+ void setBundleAlignSize(unsigned Size) {
+ assert((Size == 0 || !(Size & (Size - 1))) &&
+ "Expect a power-of-two bundle align size");
+ BundleAlignSize = Size;
+ }
+
/// @name Section List Access
/// @{
size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
+ /// @}
+ /// @name Linker Option List Access
+ /// @{
+
+ std::vector<std::vector<std::string> > &getLinkerOptions() {
+ return LinkerOptions;
+ }
+
/// @}
/// @name Data Region List Access
/// @{
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